Newborn Week 4: One Month Old — More Alert, Colic May Peak

Week 4 marks one month. Your baby is more alert and tracking faces. Colic may be peaking, and it's time for the mother's first postpartum check-up.

What’s Happening This Week

Your baby is one month old. That’s a meaningful milestone — you have both survived the hardest part of the adjustment.

Development this week is mostly about increasing alertness. Your baby is awake more — wake windows are stretching slightly toward 60–75 minutes. During awake time they are more visually engaged: tracking a slowly moving object or face for a few seconds, holding eye contact intentionally (not just accidentally). They may briefly turn their head toward a familiar sound.

Tummy time tolerance usually improves slightly — some babies can manage 2–3 minutes without crying by week 4. Head control is still minimal (they need full head support when held), but you might notice a brief second or two of them lifting their head during tummy time.

Socially, no smile yet — but some babies produce what looks like a half-smile in response to a face or voice. Don’t overthink it. The real social smile comes around week 5–6.

Feeding This Week

At one month, breastfeeding should be well-established. If you’re still experiencing pain at every latch, or your baby is not gaining weight well, see a lactation consultant — not at six weeks, now.

A formula-fed baby at one month takes roughly 60–90 ml per feed, 6–8 times a day. Do not overfeed — watch for hunger cues rather than scheduled volumes.

Spitting up after feeds is very common at this age. Most spitting up in a thriving, comfortable baby is a laundry problem, not a medical problem. If your baby spits up frequently but is gaining weight well, is not in distress, and is otherwise healthy — this is called “happy spitter” reflux and requires no treatment.

Sleep This Week

Still 15–17 hours total. No sleep schedule at one month is realistic or appropriate. You may notice the baby has one slightly longer sleep period per day — 3–4 hours. This is not a schedule. It’s biological variability.

The key question at one month is not “when will they sleep through the night” — it’s “are they getting enough total sleep and are safe sleep practices in place?” Answer those two questions and ignore the rest.

Avoid sleep aids that create dependency or are unsafe: never use sleeping on your chest (unless you are awake and alert), weighted swaddles, positioners, or products in the cot. Swaddling with a proper swaddle blanket, white noise, and rocking are safe.

Is This Normal?

Colic peaking. If your baby has been fussy in the evenings, week 4 is often when it intensifies. This is the beginning of the peak of the purple crying period (which peaks around 6 weeks). It’s exhausting. It’s not your fault. It will end.

Newborn acne. A breakout of small white or red pimples on the face and scalp between weeks 2–6 is normal — caused by maternal hormones. It looks alarming, requires no treatment, and clears on its own within a few weeks.

Mother’s Body This Week

The 4–6 week postpartum window is when postpartum depression becomes diagnosable and treatable. Symptoms that are more than the blues: persistent sadness, inability to enjoy anything, feeling disconnected from your baby, intrusive thoughts, anxiety that feels out of control.

Do not wait for your 6-week check-up to raise these symptoms. Call your doctor this week if mood has been consistently low for more than 2 weeks.

Breastfeeding mothers may notice hair shedding beginning around week 4 — postpartum hair loss is hormonal and peaks around months 3–4. It’s normal and temporary.

When to Call the Doctor

  • Baby has not regained birth weight and weight check is delayed — don’t wait, call
  • Colic crying is accompanied by fever, blood in stool, or vomiting
  • Spitting up is forceful (projectile) rather than gentle dribbling, especially after every feed
  • Flat spot developing on one side of baby’s head — mention at 1-month visit, or sooner
  • Severe or worsening postpartum mood symptoms — call your OB or physician

Real Questions from Indian Mothers

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

“How to find out if the gums are sore and tender..? My son is 4 months old but one month preterm. He has started taking objects he sees to his mouth and chewing.. how early can babies start teething?”

Check for other symptoms than soreness and tenderness Teething symptoms- 1: Excessive drooling 2: Chewing on objects 3: Irritability or crankiness 4:Sore or tender gums 5: Slight increase in temperature

“Dr. My baby is One month 2 days… He is not sleep well. He sleeps only few minutes and wake up early… and crying…”

Every babies sleep pattern is variable. It can differ with age , growth spurt ,illness and sleep regression. You can try Dim lights Minimal stimulation Rocking Swaddling Swinging White noise

Questions About Your Week 4 Newborn?

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by Babynama Pediatricians · Updated 2026-03-13