when do babies have growth spurts
Babies tend to have several predictable growth spurts in the first two years, but every baby’s exact timing is a little different.
Quick Scoop: When do babies have growth spurts?
Most babies have clustered growth spurts rather than growing at a steady, even pace. Common ages people notice them are:
- Around 7–10 days old (or 1–3 weeks).
- Around 4–6 weeks.
- Around 6 weeks is often called out on its own because it can be intense for feeding and sleep.
- Around 2–3 months (often called the 3‑month growth spurt).
- Around 4–6 months (many parents notice one near 6 months).
- Around 8–9 months.
- Around 12 months (1 year).
- Later toddler spurts often appear around 18 months and 24 months (2 years).
During the first year, babies often triple their birth weight and grow about 10 inches in length, and much of that happens in these spurty bursts.
What a growth spurt looks like (so you don’t miss it)
Parents often realize a growth spurt is happening because their baby suddenly feels like a different kid for a few days.
Common signs include:
- Hungrier than usual (feeding more often, “cluster feeding,” draining bottles or breasts).
- Fussier, clingier, harder to put down.
- Sleep changes: sometimes longer naps, sometimes more night waking, sometimes both in the same week.
- You suddenly notice clothes feel tight or baby looks “longer” almost overnight.
A typical growth spurt might last anywhere from a couple of days to about a week, with the first‑year spurts often feeling most dramatic.
Ages and spurts overview (first 2 years)
Here’s a simple at‑a‑glance view:
| Baby age | Common growth‑spurt window | What parents often notice |
|---|---|---|
| 7–10 days / 1–3 weeks | First big newborn spurt. | [9][1][7][5]Very frequent feeds, short naps, suddenly growing out of newborn clothes. | [6][8][4]
| 4–6 weeks | Early infant spurt. | [7][3]Evening fussiness, cluster feeding, more night waking. | [9][3][4]
| 6 weeks | Often called out on its own. | [1][7]Baby wants to eat constantly; routine feels like it “falls apart.” | [3][4]
| 3 months | Very noticeable spurt. | [1][4][3]More social and active; big appetite; sleep can wobble. | [4][1][3]
| 6 months | Mid‑infancy spurt. | [5][7][3]Often coincides with starting solids, rolling, or sitting; more night feeds again. | [8][3][4]
| 8–9 months | Late‑infancy spurt. | [7][1][3][5]Crawling, pulling up, separation anxiety, fussiness and appetite shifts. | [8][3][4]
| 12 months | 1‑year spurt. | [3][5]On the move; may eat “like a teenager” for a while, then slow down. | [4][8][3]
| 18 months | Toddler spurt. | [7][3]New words, new skills, extra hunger or moodiness. | [3][4]
| 24 months | Another common toddler spurt. | [7][3]Height jump, outgrowing clothes, bursts of energy. | [4][3]
A tiny “story” snapshot
You finally feel like you’ve cracked your baby’s routine: feeds are spaced out, naps are predictable. Then, almost overnight, your 6‑week‑old starts waking every 90 minutes, rooting constantly, and refusing to be put down. After three or four days of chaos, things calm—and suddenly the newborn onesies that fit last week won’t snap closed. That roller coaster is exactly how many parents describe a growth spurt.
What to do when a spurt hits
- Follow baby’s hunger cues and offer more feeds as needed (breast or bottle).
- Expect temporary sleep disruption and keep bedtime routines calm and consistent.
- Watch diapers and overall alertness to be sure baby is still well hydrated and generally well.
- If you are ever worried about weight gain, very low output diapers, or an unusually floppy or listless baby, call your pediatrician or local urgent care promptly.
Forum parents often say growth spurts feel like “three steps forward, two steps back”—routines get messy for a bit, but then baby suddenly seems bigger, stronger, and more awake to the world.
TL;DR
- When do babies have growth spurts? Repeatedly in the first year: around 1–3 weeks, 4–6 weeks, 3, 6, 9, and 12 months, and again in toddler years at roughly 18 and 24 months.
- They show up as extra hunger, fussiness, and short‑term sleep changes, often lasting a few days to a week.
Information gathered from public forums or data available on the internet and portrayed here.