How long does a growth spurt last?

Usually 2 to 5 days, sometimes up to a week. After that your baby typically settles back into a calmer rhythm by themselves.

Should I supplement with formula during a growth spurt?

If you're breastfeeding: no — the extra nursing is exactly what grows your supply within a few days. Supplementing can dampen that mechanism. If you're unsure about growth, ask your pediatrician or a lactation consultant.

When exactly do growth spurts happen?

The best-known moments are around day 7–10, around 6 weeks and around 3 months. Timing varies per child; later busy periods usually come with developmental leaps rather than feeding.

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Growth spurts: why your baby suddenly wants more

Your baby had just settled into a rhythm and suddenly they're feeding around the clock, fussy, and sleeping restlessly. Chances are it's a growth spurt: a short period in which your baby "dials up" their feeding to match what they need. It's part of normal development and passes by itself.

When do growth spurts happen?

Around day 7–10 — often the first one.
Around 6 weeks — often the most intense.
Around 3 months — usually the last of the "classic" spurts.

Exact timing varies per child; a few days earlier or later is normal. Busy periods after that tend to come with developmental leaps (rolling, crawling, teething) rather than feeding.

What you'll notice

Wanting to feed much more often, sometimes in long clusters (cluster feeding).
Fussy and unsettled, wanting to be held.
Restless sleep and shorter naps.

If you're breastfeeding it can feel like there's "not enough" milk. Usually the opposite is true: all that extra nursing is exactly what adjusts your supply within a few days. The frequent asking is the mechanism — not a sign of shortage.

What helps

Follow the demand. Feeding more often is fine — it regulates itself.
Breastfeeding: extra nursing is what grows your supply. Topping up with formula isn't needed and can dampen supply; if in doubt, ask your pediatrician or a lactation consultant.
Formula: offering a little extra is fine — most babies don't need more than about 32 fl oz a day.
Look after yourself. Growth spurt days are tiring — plan little and accept help.

When is it not a growth spurt?

Call your pediatrician if your baby also has a fever, noticeably fewer wet diapers than usual, is vomiting more than normal, or if the extreme demand lasts longer than about a week.

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Also handy: how much formula does your baby need? and how much sleep does a baby need?

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