In plain words
A growth spurt is a short period when a baby's body grows faster than usual. Parents often notice more feeding, more waking at night, and fussier days. Many people treat spurts and the fussy weeks as the same thing, but the two overlap rather than match. Popular guides list spurts at ages such as two to three weeks, six weeks, and three months. Those ages are rough. Some babies have spurts that look different. Feeding usually rises for a few days and then settles. Growth spurts are normal. On their own, they are not a sign that a baby is not getting enough milk. A clinician can check weight gain if something seems off.
The deeper version
A growth spurt is a transient increase in infant growth velocity, usually recognized from parent report rather than from measured trajectory. Feeding frequency rises during these periods, through more frequent feeds, greater intake per feed, or both. Popular week-by-week timelines place spurts at fixed ages, but the evidence for fixed timing is weak and the age ranges overlap widely. Pediatric writers such as Brazelton have described regulatory transitions in early infancy that some families and clinicians connect to these periods. The controversy is whether parental reports reliably identify true growth events, and whether fixed-age spurt charts help or mislead families who track feeding against them.
Where it comes up
- Fussy weeks and developmental changesBaby Basics
- Growth spurts and feeding changesFeeding Your Baby
- Cluster feedingFeeding Your Baby
What mothers here say about growth spurt
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Sources
- Brazelton TB, Koslowski B, Main M — The origins of reciprocity: the early mother-infant interaction (1974)
- American Academy of Pediatrics — Caring for Your Baby and Young Child: Birth to Age 5 (2014)