When Is My Baby's Next Growth Spurt?

Enter your baby's birth date to see a personalized timeline of expected growth spurts — which have passed, which is coming next, and what to watch for.

By Dysin, software engineer & parent · About & methodology

Understanding Baby Growth Spurts

A growth spurt is a brief period — usually 2 to 7 days — when your baby gains weight, length, or both faster than usual. They're completely normal and happen to every child, though the exact timing varies. The timeline above is based on commonly observed patterns from pediatric research.

Why Timing Varies

The ages shown are averages. Your baby may experience a spurt a week or two earlier or later. Some babies have several small spurts rather than a few obvious ones. Premature babies may follow adjusted-age timing — see our premature baby growth guide for details.

Growth Spurts and Percentiles

During a spurt, your child may temporarily jump up on their growth percentile chart. This is normal. Weight usually leads height — babies gain weight first, then "stretch out" over the following weeks. Track the trend with our Growth Tracker rather than worrying about a single measurement. You can also use the Growth Velocity Calculator to check whether the rate of gain is within expected ranges.

What To Do During a Spurt

For a more detailed look at each growth spurt window, signs, and how they affect breastfed vs. formula-fed babies, see our comprehensive Baby Growth Spurts Guide.

Growth Spurt Timeline FAQ

When do baby growth spurts happen?
Common growth spurt windows are 7-10 days, 2-3 weeks, 4-6 weeks, 3 months, 4 months, 6 months, 9 months, 12 months, 18-24 months, and 6-8 years. Pubertal growth spurts occur from age 8-13 in girls and 10-15 in boys.
How long does a baby growth spurt last?
Most infant growth spurts last 2-7 days. During this time, your baby may feed more frequently and be fussier than usual. The pubertal growth spurt is much longer, typically lasting 2-3 years.
What are the signs of a growth spurt?
Common signs include increased hunger and cluster feeding, fussiness or irritability, sleep changes (sleeping more or waking more often), and clothes suddenly fitting differently. These signs typically last 2-7 days.
Do growth spurts affect sleep?
Yes. Some babies sleep more during growth spurts because growth hormone is released during deep sleep. Others wake more frequently due to hunger. Both patterns are normal and usually resolve within a few days.
Should I increase formula during a growth spurt?
Follow your baby's hunger cues. If they seem hungry after finishing a bottle, it's fine to offer a small amount more. Don't force a schedule — let the baby guide how much they need. The increased intake usually lasts only a few days.
Disclaimer: This timeline provides estimates based on commonly observed growth patterns. Every baby is different — your child may experience growth spurts earlier or later than shown. This tool is for informational purposes only and is not medical advice. Consult your pediatrician with any growth concerns.