What Is a Baby Growth Spurt and Why Is Your Baby Suddenly Feral
Everything was going fine.
You had a routine. The baby was sleeping in predictable stretches. You were starting to feel like you had a handle on this dad thing.
Then overnight your baby turned into a different baby. Feeding constantly. Screaming more. Sleeping worse. Nothing you do seems to work.
Congratulations — you've hit a growth spurt.
What Is a Baby Growth Spurt
A growth spurt is exactly what it sounds like: a short period where your baby's body is rapidly growing and developing.
During a growth spurt your baby needs more calories to fuel the growth, which means more feeding. Their sleep gets disrupted because their brain is processing a lot of new development. And they're often uncomfortable and fussy for reasons they can't communicate.
The good news: growth spurts are temporary. They typically last 2 to 4 days. The bad news: there are several of them in the first year.
When Do Growth Spurts Happen
Growth spurts follow a loose pattern. Every baby is different but most hit them around these windows:
- Week 1 to 3 — first growth spurt, often subtle
- Week 6 — this one hits hard, right when you thought you had a rhythm
- Month 3 — coincides with other developmental leaps
- Month 6 — often aligned with starting solid foods
- Month 9 — crawling and pulling to stand development
- Month 12 — approaching the first birthday
The week 6 growth spurt catches most new parents off guard because it lands right when things were starting to feel manageable. You're not going backwards — you're just in a spurt.
Signs Your Baby Is in a Growth Spurt
Cluster feeding: feeding every hour or more for several hours in a row. If you're breastfeeding this can feel like the baby is never satisfied and you're producing nothing. You're producing enough. The baby is stimulating supply to match the increased demand.
Increased fussiness: more crying, harder to settle, nothing seems to help for long. This is normal. Their body is working hard.
Sleep disruption: more night waking, shorter naps, fighting sleep they normally take easily. Frustrating but temporary.
Wanting to be held constantly: more contact-seeking behavior than usual. Hold them. This phase passes.
Suddenly sleeping more: some babies do the opposite — they sleep longer than usual. Both patterns are normal during a spurt.
How to Survive a Growth Spurt as a Dad
Feed on demand. Don't try to hold to a schedule during a growth spurt. If the baby is hungry, feed them. Trying to stretch out feeds during a spurt leads to more crying and more frustration for everyone.
Lower your expectations for a few days. The routine you built is temporarily offline. That's okay. It comes back after the spurt.
Tag team more. Growth spurts are when you step up the shift system with your partner. The baby is harder to settle so the parent on duty burns out faster. Switch more frequently.
Remember the timeline. 2 to 4 days. Say it to yourself. Write it on the wall if you need to. It ends.
Don't interpret the behavior as permanent. New dads often panic during growth spurts thinking the baby has changed for good or that something is wrong. Nothing is wrong. The baby that existed before the spurt comes back after it — usually more developed and often sleeping better than before.
After the Growth Spurt
This part nobody tells you about.
After a growth spurt babies often seem like a different baby in a good way. They're more alert. They hit a new skill or become noticeably more interactive. The disruption was their brain and body leveling up.
After the week 6 spurt many babies start showing the first social smile. After the month 3 spurt you often see the first laugh. Growth spurts are hard in the moment but they're signs of exactly the development you want to see.
Track the Leaps With the First Year Dad App
Growth spurts and developmental leaps go hand in hand. The First Year Dad app helps you track what's coming so you're never caught off guard by a suddenly feral baby.