Lead
Sleep training attracts strong opinions. There is real anxiety on one side — "it's cruel to let them cry," "what about attachment?" — and real exhaustion on the other. Both are honest responses to the situation.
This article sets aside the emotional framing for a moment and looks at the numbers from RCTs and meta-analyses. The goal is less to answer "which method is right?" and more to clarify what each approach is actually doing, and under what conditions each tends to work.