Reading Baby Food Labels: Salt, Sugar, Age Ratings, and Heavy Metals

8 min read日本語版あり
Audience
Parents at or approaching the complementary-feeding stage
Target length
~1,500 words
Status
Draft v2 (translated from Japanese v1)
Original
../106_baby_food_selection.md

Lead

Stand in front of the baby-food section of any pharmacy or grocery store and you face dozens of options. "No additives." "Domestic ingredients." "Suitable from 5–6 months." The labels are dense with language, but sources that explain concretely how to interpret them are scarce.

This article works through four dimensions of that label: the basis for age-stage markings, what to look for with sodium, how sugar labeling works in practice, and the concern about heavy-metal contamination that has been developing in the research literature since 2019. The goal is not to answer "should I use commercial baby food?" but to provide the framework for "if I'm using it, what do I check and why?"

Age-Stage Markings and What They Rest On

The labels "suitable from 5–6 months" and "suitable from 7–8 months" correspond to the complementary-feeding stage classifications in Japan's Ministry of Health, Labour and Welfare Guidelines for Breastfeeding and Complementary Feeding (2019 revision) [1]. Those guidelines describe progression as follows.

Commercial baby foods are formulated to match these texture categories. But the guidelines are equally clear that age markers are guides, not triggers: when to start depends on the individual infant's developmental readiness — head and neck control, the ability to sit with support, and showing interest in food [1]. An infant who is developmentally slower than the labeled age may not yet be ready; an infant who is developmentally ready may not need to wait for the labeled age.

Reading the Sodium Column

Infant kidney function develops rapidly during the first year of life but does not reach adult equivalence. In particular, during the six-to-twelve-month period, the kidney's capacity to excrete excess sodium is limited [2]. A 2024 review by Jayasooriya and colleagues synthesized animal and epidemiological data suggesting that high sodium intake during the first year may contribute to later blood pressure elevation and the development of salt preference, providing a rational basis for restricting sodium in infant foods [2].

[Note on reference [2]]: Verification identified a closely matching article at PMID 38255411 ("The Future for the Children of Tomorrow: Avoiding Salt in the First 1000 Days," published in Children in January 2024), but this corresponds to different authors (Mazzuca et al.) rather than the Jayasooriya et al. paper listed in the Japanese source (PMID 38257137). The PMID 38257137 could not be independently confirmed. This reference is flagged [unverified] pending editorial resolution; the underlying claim — that early sodium restriction has a rational evidence base — is supported by the general literature regardless of which specific paper is cited.

At the international level, the standard for canned baby foods (CXS 73-1981, amended 2023) does not permit the addition of sodium chloride to products classified as infant foods [3]. This is a regulatory floor, not merely a recommendation.

In Japan, products explicitly labeled as complementary foods rarely contain added salt. But not every product on the shelf is labeled "complementary food" — toddler foods, dashi (stock)-based products, and sauce products may carry meaningful sodium levels. Looking at the "sodium equivalent" or "salt equivalent" entry in the nutrition information panel is more informative than relying on category labeling. A practical guideline — not an official regulatory figure — is to treat products with more than approximately 0.3 g of salt equivalent per 100 g as unsuitable for frequent use as a main course during infancy.

Reading the Sugar Column

The World Health Organization recommends limiting free sugars (defined as sugars added by manufacturers, cooks, or consumers, plus sugars naturally present in honey, syrups, and fruit juices) to less than 10% of total energy intake [4]. The WHO's 2023 complementary-feeding guidelines go further for young children, specifically recommending that no products containing added sugars be given to infants and toddlers aged 6–23 months [5].

Japanese food labeling distinguishes "sugars" (monosaccharides and disaccharides) from "carbohydrates" (all carbohydrate minus fiber). When the ingredient list includes "high-fructose corn syrup," "granulated sugar," or "fructose," that indicates added sugars. By contrast, when "banana puree" or "apple puree" appears as an ingredient, those are intrinsic sugars from intact fruit — not classified as free sugars under the WHO definition — though they do add to total carbohydrate content.

If you are trying to avoid sweetness conditioning, reading the ingredient list provides more nuanced information than the nutrition facts panel alone. A product that contains only fruit as its sweetening source is meaningfully different from one with added sucrose, even if both show similar numbers on the carbohydrate line.

Heavy-Metal Contamination: The Background

The issue of heavy metals in baby food became prominent in 2019 when the nonprofit organization Healthy Babies Bright Futures (HBBF) published an independent analysis of 168 commercial baby-food products. It found that 95% of products tested contained at least one heavy metal (arsenic, lead, cadmium, or mercury) [6]. This report prompted a US Congressional staff investigation in February 2021, which found elevated concentrations of arsenic, lead, and cadmium in products from major brands, and documented that companies were testing raw ingredients rather than finished products — a practice that tends to underestimate contamination in the final food [7].

In response, the US Food and Drug Administration launched its "Closer to Zero" action plan in 2021, establishing a framework for setting action levels for heavy metals in infant foods. A draft action level for lead in infant foods was published in 2023, and final guidance for processed baby food was issued in January 2025 [8].

The mechanism underlying this contamination is agricultural: arsenic and cadmium accumulate in soil and water and concentrate in certain crops. Rice-based products — including rice cereals and pouched rice porridges — tend to show higher arsenic levels. Root vegetables and sweet potato-based products show elevated lead and cadmium in some analyses.

Two practical implications follow.

First, food diversity is the most accessible mitigation strategy. Rotating among grain types — oats, millet, and other cereals alongside rice — distributes exposure across multiple crop sources rather than concentrating it in one. This approach is also nutritionally sound for its own reasons.

Second, the HBBF and Congressional data pertain to the US market. Products sold in Japan are governed by Japanese food safety standards rather than FDA guidance. However, the underlying agricultural contamination pathways are global: soil arsenic and cadmium levels vary by region, not by country of sale. The issue is worth being aware of regardless of which country's products you are purchasing.

Baby-Led Weaning and Commercial Baby Foods

— an approach that centers on letting infants self-feed soft finger foods rather than being spoon-fed purees — has attracted research attention over the past decade. A systematic review of BLW research found no statistically significant difference in choking risk between BLW and conventional puree-led weaning [9], and BLW groups tended to have longer periods of exclusive breastfeeding.

Within BLW practice, commercial products are not categorically excluded. Pouch foods and pre-prepared purees are commonly used as complements during outings or when preparation time is limited. The BLW framework and selective use of commercial foods are compatible; the decision is practical rather than ideological.

Practical Checklist

When selecting commercial baby food:

  1. Age marking: treat it as a texture guide. Developmental readiness — head control, interest in food — is the actual criterion [1].
  2. Sodium: check both the ingredient list and the salt-equivalent figure. For infants, products with little or no added salt are preferable [2,3].
  3. Sugar: scan the ingredient list for added sugars (high-fructose corn syrup, granulated sugar, fructose). Fruit-derived sweetness and added sweetness are distinct categories [4,5].
  4. Heavy metals: vary the grain types you use. Avoid heavy dependence on any single rice-based product [6,7,8].
  5. Give up on perfection: commercial baby foods serve a genuine function in real-life parenting. "Can my child try a variety of foods regularly?" is a more meaningful goal than "is every meal freshly prepared?"

Summary

The choice about commercial baby food is not a binary. Understanding what age markings mean, developing the habit of reading the sodium and sugar content, and knowing the structural issue of heavy-metal contamination are what allow you to use commercial products without either undue anxiety or undue confidence.

Recording the foods your child has tried in a parenting app like Memori makes it easy to notice if you are inadvertently relying on the same few products — which is relevant both for nutritional diversity and for distributing potential heavy-metal exposure.

References

  1. Ministry of Health, Labour and Welfare (厚生労働省), Japan. Guidelines for Breastfeeding and Complementary Feeding (2019 revision). 2019. https://www.mhlw.go.jp/stf/newpage_04250.html
  2. Jayasooriya S, Navaei N, Noonan G, Lila MA, Ferruzzi MG. The Future for the Children of Tomorrow: Avoiding Salt in the First 1000 Days. Nutrients. 2024;16(2):244. doi:10.3390/nu16020244. PMID: 38257137. [[unverified]: PMID 38257137 could not be confirmed by search. A closely matching article on the same topic was found at PMID 38255411 (Mazzuca et al., published in Children 2024), with different authors. Editor should resolve the correct citation — either confirm PMID 38257137 on PubMed directly, or replace with the confirmed reference.]
  3. Codex Alimentarius Commission. Standard for Canned Baby Foods CXS 73-1981 (amended 2017, 2023). Rome: FAO/WHO; 2023. https://www.fao.org/fao-who-codexalimentarius/sh-proxy/en/?lnk=1&url=https://workspace.fao.org/sites/codex/Standards/CXS+73-1981/CXS_073e.pdf
  4. World Health Organization. Guideline: Sugars Intake for Adults and Children. Geneva: WHO; 2015. ISBN: 978-92-4-154902-8. https://www.ncbi.nlm.nih.gov/books/NBK285521/
  5. World Health Organization. WHO Guideline for Complementary Feeding of Infants and Young Children 6–23 Months of Age. Geneva: WHO; 2023. ISBN: 9789240081864. https://www.who.int/publications/i/item/9789240081864
  6. Healthy Babies Bright Futures. What's in My Baby's Food? A National Investigation Finds 95 Percent of Baby Foods Tested Contain Toxic Chemicals That Lower Babies' IQ. Washington, DC: HBBF; 2019. https://hbbf.org/report/whats-in-my-babys-food
  7. US House of Representatives Subcommittee on Economic and Consumer Policy. Baby Foods Are Tainted with Dangerous Levels of Arsenic, Lead, Cadmium, and Mercury. Washington, DC: House Committee on Oversight and Reform; February 4, 2021. https://oversightdemocrats.house.gov/imo/media/doc/2021-02-04%20ECP%20Baby%20Food%20Staff%20Report.pdf
  8. US Food and Drug Administration. Closer to Zero: Reducing Childhood Exposure to Contaminants from Foods. Silver Spring, MD: FDA; 2021 (updated 2025). https://www.fda.gov/food/environmental-contaminants-food/closer-zero-reducing-childhood-exposure-contaminants-foods
  9. Fangupo LJ, Heath AM, Williams SM, et al. Baby-led weaning: what a systematic review of the literature adds on. Matern Child Nutr. 2018;14(3):e12556. doi:10.1111/mcn.12556. PMC5934812. [[unverified — possible citation mismatch]: PMC5934812 corresponds to D'Auria et al. (2018), "Baby-led weaning: what a systematic review of the literature adds on," published in the Italian Journal of Pediatrics (PMID: 29724233) — different authors from Fangupo et al. A Fangupo et al. 2016 study on choking and BLW (BLISS method) is separately documented in Pediatrics. The Matern Child Nutr reference with this DOI and these authors could not be independently confirmed. Editor should locate the correct source for the BLW systematic review findings cited in the body.]

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