Out of nowhere, a baby who had found a rhythm wants to feed almost constantly, frets between feeds, and sleeps at all the wrong times. Before you doubt your milk or your routine, look at the calendar: this is often a growth spurt — a short, intense stretch where your baby grows fast and orders extra milk to fuel it. They pass in a few days, and there’s a rough timeline to expect them.
When growth spurts tend to happen
These ages are the ones parents and midwives describe most often. Treat them as a loose map, not a schedule — your baby may run early, late, or skip one entirely.
| Age | What you’ll often notice |
|---|---|
| ~1–3 weeks | The first big one — near-constant feeding, extra fussiness |
| ~6 weeks | Frequent feeds, evening cluster feeding at its peak |
| ~3 months | Hungry but easily distracted; sleep shifts around |
| ~6 months | Often overlaps with starting solids and more movement |
How to recognise one
A growth spurt usually shows up as a cluster of changes over a day or two:
- More feeding. Suddenly hungry again soon after a feed that used to satisfy — often cluster feeding in long evening runs.
- Fussier and clingier. Harder to settle, wanting to be held more.
- Sleep all over the place. Some babies sleep more; others wake more at night.
- It passes. Within a few days things ease, often with a longer sleep stretch or a new skill on the other side.
Why it can feel like your milk “dried up”
If you’re breastfeeding, a spurt can feel like your supply has fallen behind — the baby feeds and feeds and still seems hungry. It’s the opposite: that extra feeding is the mechanism. More demand tells your body to make more, and supply usually catches up within a day or two. Unless your midwife or doctor has advised it, there’s no need to “top up” with formula to keep pace — feeding to the baby’s cues is what brings the milk up.
How long they last
Most growth spurts last one to three days, sometimes up to a week. Then the intensity fades and your baby settles back into a rhythm — frequently a calmer, more predictable one than before.
Getting through it
- Feed on demand. Follow the baby, not the clock, for these few days.
- Look after yourself. Drink, eat, and rest whenever you can; if you have a partner, tag-team the holding and settling.
- Remember it’s temporary. Marking when it started helps you see, a few days on, that it really did pass.
When it might be more than a spurt
A growth spurt fades within days. Check in with your pediatrician, family doctor, or health visitor if instead you notice:
- Fussiness or poor feeding that drags on beyond a week
- Fewer than 6 wet diapers a day, or weight gain that stalls
- Fever, vomiting, an unusually floppy or very sleepy baby, or other signs of illness
- A pattern that just doesn’t fit — your instinct that something is off is worth a call
This is general information, not medical advice. Every baby is different — if a stretch of fussiness or feeding worries you, ask the people who know your baby’s history.
During a spurt, the reassurance that matters most is the boring, countable kind: the same wet and dirty diapers and steady weight that tell you feeding is going fine. A shared log shows the spike of extra feeds and then the return to normal — proof, when you’re exhausted and doubting, that the system is working exactly as it should.