When babies tend to have growth spurts, what they look like, how much babies grow each week, and when to call the doctor.
A growth spurt is a few days when your baby seems hungrier and fussier than usual and may sleep more or less. Most last 2 to 3 days, sometimes up to a week, and then things settle again.
Parents and pediatricians often mention spurts around 2 to 3 weeks, 6 weeks, 3 months and 6 months, and sometimes 9 months. These ages are rough guides from experience, not fixed dates; many babies do not follow them, and research on the exact timing is limited.
Behind the spurts is a lot of steady growth. Using the WHO medians, girls gain about 200 g a week (about 7 oz) in the first 3 months, about 110 g a week from 3 to 6 months, and about 60 g a week from 6 to 12 months. Boys gain about 230 g, 120 g and 65 g a week over the same periods. Median length grows about 10 to 11 cm in the first 3 months and about 25 cm over the whole first year.
The usual signs are feeding much more often, waking more at night, wanting to be held, and being harder to settle. Breastfed babies often cluster feed, asking to nurse every hour or so for part of the day. Frequent feeding during these days helps build milk supply.
What helps: feed on demand, expect a few unsettled days, and keep an eye on wet and dirty diapers as a sign your baby is getting enough. Formula-fed babies may want a little more per feed or slightly more often; follow their hunger cues and ask your pediatrician before making big changes.
Call your pediatrician if your baby has fewer wet diapers than usual, seems unusually sleepy or hard to wake, has a fever, refuses feeds, or if the fussiness lasts more than about a week. Those are not typical of a growth spurt.
A spurt does not always show up on the chart right away. Weight measured a week later is more useful than weight measured in the middle of a fussy day. Logging measurements over time in Growthling shows whether your baby is following their curve.
Sources: WHO Child Growth Standards (weight-for-age and length-for-age medians); American Academy of Pediatrics, HealthyChildren.org. This article is general information, not medical advice.
This article is for informational purposes only and is not a substitute for professional medical advice. Always consult your pediatrician about your child's growth and development.
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