Articles

Parenting essays by Leon Moriguchi, 0–6 years, grounded in peer-reviewed research.

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All articles (301)

Three Lines a Day: Why Logging Helps Parents Survive the Tantrum Years
Thirty Minutes Is Not Failing: What the Sleep-Onset Data Actually Show
First Moments Arrive Unannounced — Seven Memory Anchors for Parents 0–6
One Line a Day: Why the First Three Months Deserve Words, Not Just Photos
The First Smile You Remember: Where Memory and Medicine Disagree
Why "Average" Is the Wrong Yardstick for Your Baby's Milestones
The Vaccination Record Two Ways: Paper and Digital, and Why You Want Both
When Words Are Late: A Quiet Defense of Not Rushing Your One-Year-Old
Weaning Off Social Media's Advice: How to Decide When to Stop
Toilet Training Doesn't Need to Start in Summer: Unwinding a Seasonal Myth
Why Logging Picky Eating Helps More Than Trying to Fix It
The Day Your Four-Year-Old Says "I Hate You"
Sharing the Log: When Co-Parents Should and Shouldn't See Each Other's Records
The 30,000-Photo Problem: Storage Isn't the Issue, Findability Is
Where Does a Childhood Record Go After Childhood?
Colic, Read as a Neurological Phenomenon: What the Crying Curve Is Actually Telling You
Night Feeding Logs: Keep, Cull, or Throw Away?
Reading the Newborn Weight Curve: What Matters Is the Slope, Not the Single Point
Postpartum Depression and Its Threshold: EPDS, and What Falls Below It
Paternal Perinatal Depression: A Quieter Risk, Easily Missed
Breast Milk, Formula, or Both: What You're Actually Comparing
Sleep Position and SIDS: Reading the Probability, Not the Headline
Newborn Screening: What It Catches, and What It Doesn't
Starting Solid Foods: Where the "Four-Month" and "Six-Month" Guidelines Actually Agree
Introduce Peanuts Early: How LEAP Changed Allergy Prevention
Stranger Anxiety and Separation Protest: Reading Them Through Attachment Theory
Self-Feeding and Choking Risk: The Numbers Behind the Decision
What the 9–10-Month Checkup Actually Measures — and What It Doesn't
Iron Deficiency After Six Months: The Risk That Doesn't Announce Itself
Baby Signs: What the Meta-Analyses Actually Say
Baby Carriers: Where the Evidence Is Strong, and Where It Isn't
When the 18-Month Checkup Flags Something: A Framework for What Comes Next
Biting and Hitting at One: Reading Aggression as Development
The Vocabulary Spurt — The 50-Word Inflection Point and the Move to Two-Word Speech
Screen Time Guidelines, Read in Full: What WHO and AAP Actually Say
Dropping the Nap — What Age, and What's Actually Happening
Does Reading Aloud Actually Work? Calibrating the Evidence
The "No" Debate, Settled
Tantrums or Something More: A Calm Guide for the Uncertain Threshold
When a Sibling Arrives: Reading the Firstborn's Regression as Development
"Say Sorry" — What Children Actually Understand About Apology at 2 and 3
The Beginnings of Number: From Subitizing to the Cardinality Principle
Pretend Play and Theory of Mind: What the Research Actually Says
From Scribble to Figure: How Children's Drawing Actually Develops
Biting, Hitting, Kicking — The Developmental Trajectory of Physical Aggression
The "Why" Phase: When Not Answering Is the Right Move
When to Step In — and When Not To — During Preschool Friendship Conflicts
Lying and Theory of Mind: Observe Before You Scold
Choosing a Preschool or Daycare: Which Indicators Are Evidence-Based, and Which Are Not
Imaginary Companions: Neither a Warning Sign Nor a Mark of Genius
Genital Touching in Young Children: What Parents Should Know
Where Sex Education Begins: Comprehensive Sexuality Education and the Private Parts Conversation
Monsters and Darkness: Why Childhood Fears Are a Feature of Development, Not a Flaw
Scissors, Glue, and Making Things: How Fine Motor Skills Develop
Before Letters Come Words: What Emergent Literacy Research Says About Reading Readiness
How Children Learn to Read Hiragana — and Why the English Literacy Playbook Doesn't Quite Apply
Number Sense Before Arithmetic: What Actually Prepares Young Children for Math
Why Losing Feels Catastrophic at Four — and What to Do About It
"That's Not Fair": What Children Mean When They Say It, and How Jealousy Develops
Early Education: What the Evidence Actually Shows
Extracurricular Activities: What Research Says About Age and Stick-to-it-iveness
Balance Bikes and Training Wheels: What the Research Shows
The Development of Gender Identity: What Research Tells Parents of 2–6 Year Olds
"I'm Not a Baby Anymore" — The Emergence of the Self-Concept
School Readiness: What Research Says Actually Matters Before First Grade
The Six-Year Wall: Separating the Real Phenomenon from the Label
Choosing a Primary School: What the Research Actually Shows
Self-Regulation After the Marshmallow Test: What the Replications Actually Showed
When Friendships Get Complicated: What Happens Around Ages Five and Six
Starting an Allowance: What Research on Children and Money Actually Shows
Screens in Perspective: Managing Technology for Children Ages 5–6
When the Ceremony Ends: The Psychology of Milestone Moments for Parents
The Emergence of Metacognition: When Children Begin to Know What They Know
Sharing with Grandparents: How Much, in What Form, and by Whose Design
Parental Leave in Practice: International Comparisons and Family Outcomes
Returning to Work and the Childcare Transition — What the Evidence Actually Shows
How Caregivers Cooperate — What Coparenting Quality Means for Child Development
Sharenting — Children's Privacy and the Digital Footprint They Didn't Choose
When Disaster Strikes, Can You Access Your Child's Records?
When Your Child Gets Sick Again — Building a System Before the Fever Arrives
The Only-Child Stereotype, Dismantled: What the Research Actually Says
Twins, Triplets, and the Work of Seeing Each Child
Raising a Child Alone: What the Research Shows, and What It Misses
Raising a Child in Two Languages: What the Research Actually Says
Adoption, Foster Care, and the Ethics of Keeping Records
Preterm Catch-Up Growth: Reading Development Through Corrected Age
Low Birth Weight and Developmental Outcomes: A Spectrum, Not a Single Diagnosis
Families Raising Children with Disabilities: Resilience, Adaptation, and What the Research Actually Shows
The Medical Visit Log: How Families and Care Teams Can Talk the Same Language
Food Allergy as a Long-Term Condition: The Case for Continuous Records
Logging Asthma Over the Long Haul: Making the Run-Up to an Attack Visible
What to Record When Your Child Is Hospitalized: Keeping a Log from the Family's Side
Choosing Developmental Support: Where Policy and Research Intersect
ASD/ADHD Subthreshold — Living Without a Diagnosis and What Records Can Do
After Loss: What Recording Means When a Baby Has Died
Transnational Adoption and the Work of Cultural Memory
When Children Have a Say: The Development of Medical Assent
The Three-Generation Pedigree: What Your Family's Medical History Can and Cannot Tell You
Work and Parenting at the Same Time: What Forty Years of Research on Spillover Actually Shows
The Parent's Own Story: Why You Are Also Writing a Life
What Makes Something Toxic: Paracelsus, ADI, NOAEL, and the Safety Factor of 100
Why Your Baby's Stool Changes Color: The Biochemistry Behind Normal and the Signs That Matter
Beyond Bristol: The BTISS Scale for Evaluating Infant Stool
Choosing a Stroller: What Safety Standards and Research Actually Say
Car Seat Regulations, Rear-Facing Evidence, and the Used-Seat Question
Reading Baby Food Labels: Salt, Sugar, Age Ratings, and Heavy Metals
Food Additive Urban Legends, Debunked: Nitrites, Phosphates, and Preservatives
What "Organic," "Additive-Free," and "Natural" Actually Guarantee
Sugar and Artificial Sweeteners: What the Evidence Says for Young Children
BPA and Phthalates: Reading the Evidence on Endocrine Disruption
PFAS: Sorting Out a New Area of Concern
Nanoparticles and Microplastics: What We Know, What We Don't
Tapes, Pants, or Cloth: How to Think About Diaper Choice
Baby Bottles After Microplastics: A Framework for Material Choice
Baby Bedding and SIDS: What the Research Says About the Sleep Environment
What the Research Actually Says About "Educational" Toys
Night Waking from 6 to 18 Months: Why Self-Settling Is the Real Variable
"Yuta Wants To": Why Toddlers Speak of Themselves in the Third Person
"My Baby Isn't Shy Around Strangers" — Stranger Wariness and Attachment Quality Are Separate Things
Why Toddlers Fall Apart at 5 p.m. — Cortisol Rhythms and the Evening Meltdown
Sibling Age Gap — What the Evidence Actually Says
Father Involvement and Child Development — A Path That Operates Independently of Mothers'
Why Writing Things Down Makes Parents Feel Better — The Psychology of Expressive Writing
Reading AI Probability Estimates — A Literacy Guide for Memori Users
Mean, Median, and Percentile: How to Read a Well-Child Checkup Result
Will Your Child's Baby Records Still Be Readable in 50 Years?
When the AI Says "Normal": Who Is Responsible for the Judgment?
After the NICU: The Three Months Nobody Warns You About
The Parent's Body During Early Childcare: Tendinitis, Pelvic Floor Disorders, and Sleep Debt
Postpartum Sexuality: What Longitudinal Research Actually Shows
What the Research Actually Says About Same-Sex Parenting
Raising Children in Minority Cultures in Japan
How to Talk to Children About Death: Developmental Stages and the Right Words
When a Pet Dies: Often a Child's First Encounter with Death
When Friendships Fade After Having a Child
"Difficult to Raise" — What Temperament Research Actually Means
How You Were Raised Shapes How You Parent — The Intergenerational Transmission of Attachment
Parenting in the Heat — Heatstroke Risk and Thermoregulation in Infants and Toddlers
Parenting Through Winter — Decision Criteria for RSV and Influenza Season
Traveling with a Baby — Cabin Pressure, Jet Lag, and Unfamiliar Beds
Moving House and Young Children — What the Research Actually Says
Puberty Is Already Underway — Tanner Stages, Growth Spurts, and When to Seek Help
Bystanders Are the Majority — Reading Bullying Beyond the Bully-Victim Frame
"Not Getting Up in the Morning" Is Not a Character Flaw — Understanding School Refusal and Orthostatic Dysregulation
Head Lice at School — Evidence on Treatment and Preventing Reinfestation
Peanuts: When and How — The LEAP Trial and What It Changed
"They'll Slim Down When They're Older" — What Longitudinal Studies Actually Show About Childhood Obesity
Understanding Specific Learning Disorder — Dyslexia, Dysgraphia, and Dyscalculia
At What Age Should Children Get Smartphones? — Reading the Twenge/Haidt Debate to Design Your Own Approach
Why Age 7 Is a Peak Year for Traffic Injuries — Cognitive Development and the Walk to School
Why the Antibiotic Course for Strep Throat Is 10 Days — The Evidence Behind Completing Treatment
Taking the Photo, Losing the Moment — Putting the Photo-Taking Impairment Effect to Work in Parenting Records
Roseola — Why the Rash After the Fever Is Actually Good News
Why No Honey Under One Year — Spores, Infant Gut, and the Limits of Cooking
A Map of the Four Stages of Solid Foods — Texture, Volume, and Ingredients at Each Step
Designing Away the "I Only Looked Away for a Second" — Room-by-Room Injury Prevention by Developmental Stage
Tooth-by-Tooth: Logging the Transition from Baby Teeth to Permanent Teeth
Two Hours Outside — What the Evidence Actually Says About Managing Childhood Myopia
Bedtime Is Drifting — What Happens to a School-Age Child's Brain When Sleep Erodes
Does Eating Breakfast Make Children Smarter? — What RCTs Say About Acute vs. Chronic Effects
Not Anemic — But Still Iron-Deficient: The Invisible Shortfall in Girls After Their First Period
"My Head Hurts" — Three Clues for Distinguishing Migraine, Tension, and Orthostatic Headache at Home
The Reading Comprehension Wall — Why "Can Read" and "Understands" Come Apart Around Grade 3
When Math Word Problems Stall — Where Working Memory and Language Comprehension Collide
When LD, ADHD, and ASD Overlap — The Limits of the Single-Diagnosis Model
Reading a WISC-V Report — Why the Profile Matters More Than the IQ Score
Resource Room or Special Education Class? Understanding Your Options Before Deciding
How Ability Grouping Changes Children — What Longitudinal Research Shows
Does Homework Actually Work? What Cooper's Meta-Analyses Found — and Why the Grade Level Matters
Cram Schools, Kumon, and Online Learning — What the Evidence Actually Says
What Extracurricular Activities Actually Build — Evidence on Music, Sports, Language, and Coding
Does Starting English Earlier Really Help? What Second-Language Research Actually Says About the "Critical Period"
When Giftedness and Disability Coexist — Understanding and Supporting Twice-Exceptional Children
What the "Gang Age" Actually Means — Reading 9- and 10-Year-Olds' Same-Sex Peer Groups Through a Developmental Lens
What "No Friends" Actually Means — The Developmental Difference Between Solitude and Isolation
Exclusion and the Silent Treatment Are Violence — Relational Aggression and Its Digital Amplification
How Long It Takes to Make Friends After a School Transfer — What Longitudinal Research Shows About Adaptation
Inside "Can't Speak in Class" — Stuttering and Selective Mutism, and What Each Requires
School-Age Anxiety Doesn't Look Like "Anxious" — Understanding a Symptom Profile Adults Often Miss
Childhood Depression Doesn't Look Like Sadness — Recognizing a Condition School-Age Children Don't Show the Way Adults Expect
Where Does "Fixation" End and OCD Begin? — Clinical Distinctions Between ASD Repetitive Behaviors and Childhood Obsessive-Compulsive Disorder
"Stop It" Makes It Worse — The Neurobiology of Tic Disorders and How Families Can Help
What Self-Harm Means — Understanding School-Age Self-Injury as a Failure of Emotion Regulation
When "I Don't Want to Get Fat" Starts Early — Risk Pathways to Eating Disorders in School-Age Children
What Is Playing on Your Child's YouTube — How the Recommendation Engine Works and What Parents Can Actually Do
The Psychology of Loot Boxes and Children's Sense of Money — How In-Game Purchase Design Works and How to Plan for It
Children Who Confide in AI — Research on Emotional Attachment and How Families Can Approach It
A Child's Digital Footprint — Designing for "Preserving" and "Protecting" at the Same Time
Before the Body Changes — Puberty's First Signs and the Language Families Need
Sexual Curiosity in School-Age Children Is Normal — The Real Question Is Where the Information Comes From
Designing the Transition to Bathing and Changing Separately — Developmental Cues and How Children Acquire Bodily Privacy
"Why Does Only She Get One?" — Sibling Inequity and the Record Gap
"Where Are You Right Now?" — The Limits of GPS and the Ethics of Tracking Kids
The "Latchkey Kid" Question — Designing Home Alone, Outside Alone, and Key Management by Development and Context
How to Evaluate the "Quality" of After-School Care — Designing the Hours After School
Allowance in the Age of Digital Payments — Designing Financial Education for School-Age Children
Where Do School Health Checkup Results Go? — Designing a Home Record and Using It
When the Pre-School Health Screening Returns "Follow-Up Needed" — What Each Finding Actually Means
A Map for After the School Health Checkup — Understanding "Specialist Evaluation," "Treatment Needed," and "Observation"
Mycoplasma Pneumonia — The Pitfalls of "Walking Pneumonia" and the Antibiotic Resistance Problem
Fifth Disease and Risk to Pregnant Contacts — Thinking Through the Household Chain
Ear Infections, Sinusitis, and Adenoids — Understanding a Connected System in School-Age Children
Eczema and Hives in School-Age Children — Designing Management That Breaks the Flare Cycle
Don't Call It "Psychosomatic" — Functional Abdominal Pain, IBS, and Constipation in School-Age Children
How Long Will Bedwetting Last? — A Medical Guide to Nocturnal Enuresis and Daytime Incontinence in School-Age Children
Three Conditions to Know Before Writing It Off as "Growing Pains" — Osgood-Schlatter, Sever's, and Scoliosis
A "+" on the School Urine Test — From Orthostatic Proteinuria to Nephritis
Whose Album Is It? — Six Years of Gradually Transferring Ownership
The School Sports Day Problem — Understanding the Cognitive Bias That Shapes Your Child's Album
The Moment the Phone Turns Around — When a Child Becomes a Maker of Records
Why the Album Opens and One Parent Isn't There — The Structural Problem of the Invisible Photographer
Keep It or Delete It? — A Child's Right to Be Forgotten and the Reconstruction of Autobiographical Memory
Sharenting, Twelve Years Later — The Day Photos Posted at Birth Come Back to the Child Who Was in Them
Extracurricular Records as a Portfolio — Designing Visible Growth Through the School Years
Before You Worry That Your Child Has Stopped Talking — What Research on Secrecy Tells Us
The Threshold at Age Eight — What a Diary Does to Autobiographical Memory
The Day "Fun" Is No Longer Enough — The Development of Emotional Vocabulary in the School Years
What the Yearbook Keeps and What It Doesn't — The Difference Between Public and Private Records
Before You Believe "X Times the Risk" — How Statistical Literacy Changes the Way You Read Parenting Information
Which Doctor for Which Symptom? — A Guide to Finding the Right Care
After the Developmental Assessment — How to Receive DQ, IQ, and Screening Results
Reading Allergy Test Results — Sensitization and Symptoms Are Not the Same Thing
What to Do After Your Child "Fails" the School Health Screening — A Guide to Follow-Up for Heart, Hearing, and Vision
What, When, and How Much — A Practical Guide to Medicating Children
"Can I Just Give Sports Drink?" — The Science of Childhood Dehydration and Oral Rehydration Solutions
Probiotics, Vitamin D, and Herbal Medicine in Children — What the Evidence Actually Says
RSV — Why a "Common Cold" Virus Can Be Serious in Infants
Rotavirus Gastroenteritis — How Vaccination Changed the Illness for Young Children
Norovirus — A Practical Protocol for Containing Household Spread
Hand, Foot, and Mouth Disease — Recognizing the Complications Within a Mostly Mild Illness
Herpangina — Blisters at the Back of the Throat and a Week of Managing Dehydration
Bronchiolitis — The Wheezing Infant and the Case for Doing Less
Croup — When a Barking Cough Wakes Your Child at Night
Acute Otitis Media — Why "Always Prescribe Antibiotics" Is No Longer the Standard
Kawasaki Disease — What Five Days of Fever Means
Umbilical and Inguinal Hernias — Making Sense of the Bulge
The Newborn Rash — Distinguishing Infant Eczema, Cradle Cap, and Atopic Dermatitis
Diaper Rash: Irritant, Candida, and What Else — A Guide to the Differential
Atopic Dermatitis — From Reactive Treatment to Proactive Management
Food Allergy First Symptoms — Understanding the Fear
Infantile Hemangioma — Living with the Red Mass That Appears in the First Month
Why Feeding Eczema-Prone Infants Earlier May Protect Them — The Dual Allergen Exposure Hypothesis
Inguinal Hernia and Undescended Testis — What to Know When Surgery Is Recommended
When Your Baby Hasn't Pooped in Three Days — Functional Constipation and When to Think of Hirschsprung Disease
The "Happy Spitter" and the Line It Shouldn't Cross — GER vs. GERD in Infants
Pool Fever Isn't Only a Summer Thing — A Complete Picture of Adenovirus Infection
Should the Mumps Vaccine Stay "Optional"? — Hearing Loss Risk and Vaccination Coverage
From "Everyone Gets It" to "Most Don't Anymore" — Varicella Vaccination in Japan Since 2014
What "A Measles Case in Japan" Actually Means — Imported Cases and Severity After WHO Elimination Certification
Rubella Isn't Just Your Problem — Congenital Rubella Syndrome and the Logic of Herd Protection
Before the Baby Gets Whooping Cough — The Cocooning Strategy and Booster Vaccination for Families
Molluscum Contagiosum: Should You Treat It? — What the Meta-Analysis Actually Shows
Stopping Impetigo from Spreading — Evidence on Antibiotics and Household Infection Control
Tamiflu and Abnormal Behavior — What Japan's Regulator Concluded, and Why "Don't Leave Them Alone for Two Days" Applies to Every Drug
"Purple Spots on the Legs" — IgA Vasculitis: From Diagnosis to Watching for Kidney Involvement
"Fever Every Three to Four Weeks, Without Fail" — The Road to a PFAPA Diagnosis
When a Child Seems to Become a Stranger — Anti-NMDA Receptor Encephalitis and Autoimmune Encephalitis
Baby Carriers: When Can You Start? — Conditions for Newborn Use and Signs It's Time to Stop
Why Not Cow's Milk Before One Year? — Renal Solute Load, Iron Deficiency, and the Line Between Drinking and Eating
When to Introduce Eggs — Whole Egg, Yolk, White, and What Cooking Temperature Actually Does
Raw Fish for Children: When Is It Safe? — Parasites, Mercury, and Bacterial Risk by Age
At What Age Can Children Have Caffeine? A Guide to Safe Limits from Infancy Through Middle Childhood
When Can You Take a Baby to the Pool? Chlorine, Infection Risk, and Age Guidelines
Flying with a Baby — Age Restrictions, Their Medical Basis, and What Happens to Little Ears
How Long Is Too Long for Co-sleeping? When and How Children Learn to Sleep Alone
When Should a Child Have Their Own Room? Privacy Development and the Sleep Environment
At What Age Can a Child Bathe Alone? Drowning Risk and Supervision Guidelines
Sex Education at Every Age: What to Talk About, and When to Start
Can In-App Purchases by Minors Be Reversed? Japan's Minor Contract Rescission Right and the Reality of Gaming Disputes
Baby-Led Weaning: What the Evidence Actually Shows About Autonomy and Choking Risk
Supplementing Iron Through Solid Food — What to Feed, How Much, and How to Maximize Absorption After Six Months
Picky Eating, Food Refusal, and Mealtime Behavior — A Developmental and Neurological Framework
What Young Children Should Drink — The Evidence on Juice, Milk, Tea, and Caffeine
Eating Together — What Longitudinal Research Actually Shows About Family Meals
Three Sleep Training Methods Compared — Reading the RCTs on Ferber, Cry It Out, and Camping Out
Co-Sleeping and SIDS — Why the AAP's Recommendations Cannot Simply Override Cultural Practice
When Naps Diminish and Disappear — The Transition Timeline and the Structure of Early Waking
Screaming in the Night, Wandering the House — A Guide to Distinguishing Night Terrors, Sleepwalking, and Nightmares
Parenting Is Physical Labor — The Epidemiology of Back Pain, Tendinitis, and Burnout
What Happens to the Body After Birth — The Science of Hair Loss, Weight, Menstruation, and Contraception
Relationships Under Pressure — What Gottman's Longitudinal Research Shows About the Parenting Years
Parental Leave, Career Interruption, and the Myth of the "Productive" Break — What Wage Research Actually Shows
Diapers: Change Frequency, Rash, and Blood in the Stool — The Evidence Behind Everyday Questions
Childhood Constipation — From the Rome IV Criteria to Enemas: What the Evidence Actually Supports
Toilet Training in Practice — Readiness Signs, Tools, Reward Charts, and the Night Diaper
If a Child Has Swallowed Something — A Four-Level Response Guide
Burns, Cuts, and Head Injuries — A Decision Map for "Go Now or Wait and Watch"
Foreign Objects in Nose, Ear, and Eye — What You Can Try, and What You Should Not
Child Car Seats: What Correct Use Actually Looks Like — Starting from the Data on Usage and Fatality
School-Age Drowning — Why Swimming Ability Is Not the Same as Drowning Prevention
"Move What Is Within Reach" — What Home Environment Design Can Do for Child Suicide Prevention
Japan's Newborn Paperwork: What to File in the First 100 Days
Navigating Japan's Developmental Support Benefits — A Map of Seven Systems
From Daycare to Primary School — What to Know at Japan's Transition Points
Paying for Education in Japan — School Fee Aid, Child Allowance, and Post-Junior NISA Savings
Raising a Child Abroad — Birth Registration, Vaccinations, and Nationality: Three Things to Sort Out
"The Japanese Is Disappearing" — What Bilingual Research Actually Says About Heritage Language and Re-entry
Before Choosing an International School — Accreditation, Legal Status, and Costs
Why Finland Starts School at Seven — What PISA-Era Research Reveals About School Entry Age
Male Genital Care in Boys — Retraction, Cleaning, and When to See a Doctor
What You Can Do on a Fever Night — Fluids, Clothing, and When Medicine Helps