A baby who's suddenly ravenous, clingier than usual, and sleeping differently for a few days is a familiar pattern to most parents — and it's usually a growth spurt, a short burst of rapid physical development. Knowing what's actually typical helps tell a normal spurt apart from a longer pattern worth mentioning to your pediatrician.
What a growth spurt actually looks like
Wanting to feed noticeably more often and for longer stretches
Sleep changes in either direction — longer stretches, or more frequent waking from hunger
Increased fussiness or clinginess, wanting more physical contact than usual
Clothes and diapers fitting more snugly within a short window
How long they actually last
This is the detail that matters most for telling a growth spurt apart from something else: they're short. Most growth spurts last no more than a few days, even though the broader window of increased appetite and fussiness around one can stretch to a couple of weeks. If a baby has been noticeably fussier and hungrier for a month with no letup, that's less likely to be a single ongoing growth spurt and more worth a conversation with your pediatrician.
When they tend to happen
Common windows include roughly 7–10 days, 2–3 weeks, and 4–6 weeks old, with growth spurts continuing at a less predictable cadence throughout the first year. Every baby's timing varies, and not every baby has a dramatically noticeable spurt at every commonly cited age.
What normal weight gain actually looks like
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For the first four to six months, roughly 4 to 7 ounces of weight gain per week is typical, slowing to about 3 to 5 ounces per week after that. Most babies double their birth weight by four to six months and triple it by their first birthday — but your pediatrician tracking your baby's own growth curve over time matters more than comparing to any single average.
During a growth spurt, feed on demand rather than trying to stick to a usual schedule — a few days of more frequent feeding is the body's normal way of building up milk supply or matching formula intake to a genuine increase in need.
If you have any real concern about your baby's growth — not gaining weight as expected, or persistent feeding difficulty beyond a short spurt — that's a conversation for your pediatrician, who can check it against your baby's own growth curve rather than a general rule.
Sources
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