Growth spurts, decoded

Medically-informed · Sources: CDC · Updated June 2026 · 3 min read

The pattern

A previously settled baby suddenly feeds constantly, sleeps oddly and wants holding around the clock — for two or three days. Commonly seen around weeks 2–3, 6, and 3 months, though babies read different calendars.

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What's happening

Rapid growth demands calories, and frequent feeding is the ordering system: demand tells supply to scale. The clinginess is part of the same package — growth is disorganizing work.

Is this normal for your baby?

FirstWeeks answers with your baby’s age and today’s log in mind — with pediatric sources attached.

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How to run the days

Feed on demand, lower the ambition level, hydrate and snack yourself if breastfeeding, and treat the stretch as weather: real, temporary, not caused by anything you did.

Spurt vs problem

A spurt keeps the diaper counts normal and resolves within days at a new baseline. Falling wet counts, feeding refusal, fever or a baby who seems unwell — different story, pediatrician call.

The log advantage

Your tracker makes spurts visible: feed frequency jumps, then settles. Watching the pattern resolve on a chart is oddly reassuring at 4 AM.