Newborn Week 3: Growth Spurt, Cluster Feeding & Colic Begins

Week 3 brings the first growth spurt, intense cluster feeding, and the start of colic and the 'purple crying' period — here's what to expect.

What’s Happening This Week

Week 3 is when many parents feel like something has “gone wrong” — the baby suddenly seems fussier and hungrier than before. Nothing has gone wrong. This is the 3-week growth spurt.

Your baby is growing fast — roughly 200 g per week in the newborn period. Growth spurts mean the brain and body are demanding more resources. Feeding will intensify. Fussiness will increase. This is normal and temporary.

Beyond feeding, there are small but real developments happening: your baby is tracking moving objects a little more consistently, and their grip is noticeably stronger. They may have brief moments of what looks like focused attention — staring at a high-contrast pattern or your face.

Feeding This Week

Growth spurt feeding is relentless. Your baby may want to feed every 60–90 minutes or less for several days. This is not a supply problem — this is the mechanism by which supply increases. The baby demands more, the breast produces more. If you switch to formula during a growth spurt, supply drops permanently to match the reduced demand.

Cluster feeding intensifies. Evening cluster feeding (multiple feeds in a 2–3 hour block) becomes more pronounced. Your baby is not “starving” — they are biologically primed to feed frequently in the evenings to boost overnight supply.

Timed intervals go out the window during a growth spurt. Feed on demand, as often as your baby asks. This phase typically lasts 2–5 days.

Sleep This Week

Sleep remains fragmented but is very slowly becoming slightly more organized. Your baby may have one slightly longer stretch (2–3 hours) per 24-hour period — often in the early part of the night, or early morning. Do not expect this to be predictable.

Introduce tummy time this week — supervised, while baby is awake and alert. Start with 1–2 minutes, 2–3 times per day on a firm surface. Your baby will hate it. That’s normal. It’s still important for neck and shoulder development and prevents positional plagiocephaly.

Is This Normal?

Colic may be starting. Colic is defined as crying for more than 3 hours a day, more than 3 days a week, for more than 3 weeks, in an otherwise healthy baby. The “purple crying” period — a normal developmental phase of inconsolable crying — typically starts around 2–3 weeks, peaks at 6 weeks, and resolves by 3–4 months.

Signs of purple crying: the baby cries intensely in the evening or afternoon, nothing seems to help, the baby cannot be distracted, they look uncomfortable but are not sick. Their face may go red. Their legs may pull up or extend. This is not a sign of pain or illness in most cases — it’s an immature nervous system under load.

What helps: swaddling, white noise, motion (gentle rocking or car ride), feeding if hungry, skin-to-skin. Nothing works every time. The phase does end.

Mother’s Body This Week

Sleep deprivation is cumulative by week 3. The emotional toll of weeks of broken sleep is real. If you have a partner, this is a good time to establish explicit night-shift arrangements — not “wake me if you need help” but structured turns.

Breastfeeding mothers: your nipple soreness should be improving by now if latch is correct. If you still have significant pain at every feed, see a lactation consultant. Pain is not just “part of breastfeeding” — it’s usually a latch issue that can be fixed.

When to Call the Doctor

  • Crying is accompanied by fever (37.5°C or above)
  • Baby is not eating — refusing multiple feeds in a row, or showing no hunger cues
  • You notice blood in the stool (not just dark green — actual red or maroon)
  • Baby seems to be in genuine pain (not just fussy) — arching back severely, high-pitched unusual cry
  • You are feeling unable to cope, having thoughts of harming yourself or the baby — call your doctor immediately

Real Questions from Indian Mothers

These are real questions asked by parents in the Babynama community, answered by our pediatricians.

“My baby is 1.5 months old and since when he has got his vaccination he is kinda reckless, doesn’t relax like before vaccination. Mostly cranky and crying. He had colic issue 3-4 days but now he is better but still cranky. What could be the reason?”

This can happen post vaccination. Apply ice pack wrapped in cloth at vaccination site. Distract the baby. If fever occurs or pain doesn’t improve on ice pack, you can give paracetamol also

“Baby does not cry much because of colic but the amount of gas that comes out has increased, that’s why wanted to know if it is because of the formula or anything else”

Okay! Try Burping the baby well. Give tummy massage. Do cyclic moments of legs. Give tummy time. If not resolved, then we will plan regarding formula milk if symptoms doesn’t improve

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Medically Reviewed

by Babynama Pediatricians · Updated 2026-03-13