Baby week 4: one month done — and the first coo is coming
The first month complete — the tunnel of the longest four weeks is behind you. The baby now 'sees', pauses to listen, and is testing its first sounds.
First light in the tunnel
Someone said it right — the first month passes counted not in days but in nights. That count completes today. And right at this turn, the baby begins to answer back.
The answers are small: crying that stops at your voice, a gaze that settles on your face, a throat trying out 'coo' and 'goo'. But against those small answers, every night of the past four weeks grows lighter.
The month's milestone is also a bookkeeping stop — the weight trend, the vaccine card, and the date of the mother's own check-up. All three are on this page.
Your baby this week
Vision: face recognition is now firm — the mother's face above all. Brief tracking of moving things has begun. Eyes drifting out of line occasionally is normal at this age — a squint that is constant (and persists past 3-4 months) is one for the doctor.
Voice: 'coo', 'aah', 'ooh' — the first throat sounds belong to this stretch. Answer, pause, speak again — that is the first conversation and the foundation of language. The sweet truth: the baby is learning whichever tune the house speaks.
Strength: in tummy time the head now lifts to 45 degrees, briefly. In arms the head lolls less — but support is still needed every time, for months yet.
The month's weight receipt: most babies add 700 grams to a kilo in month one. The number belongs on the MCP card — the trend lives there, not in memory.
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The mother matters too
The six-week postnatal check is in the coming weeks — booked, yes? Along with stitches, uterus and BP, the mind's check matters equally: sadness, irritability, sleeplessness even when the baby sleeps, dark thoughts — say any of it at that visit. Postpartum depression is common and fully treatable — speaking is the only prerequisite.
The other big item at that check is family planning, and one fact to carry in: breastfeeding is not guaranteed contraception. Pregnancy is possible before the first period returns. Have the question ready — which method is safe while feeding.
Don't audit the body against 'how it was' yet — nine months of change doesn't reverse in nine weeks, and there is no exam to pass. Once the forty days end: light walks and breathing-plus-pelvic-floor work. That much is the whole syllabus for now.
What to do this week
Fix the six-week vaccine date (Penta-1, OPV-1, Rota-1, PCV-1, fIPV-1) — the tracker above turns the birth date into the exact day. All free at the government centre; MCP card along.
Start the baby's paper life — birth certificate copies if issued, and the Aadhaar enrolment details. Every later document flows from these.
Make the daily 'conversation' a ritual — during massage, while changing: talk, sing, answer every sound. The lullabies played to the bump now work double — a familiar rhythm calms fastest.
Sunshine and vitamin D — gentle morning sun is a good habit but is not considered sufficient on its own; most paediatricians prescribe vitamin D drops (400 IU). Ask at the next visit and come home with it written down.
Week 4 (1 month) at a glance
The week's essentials in one place. Your doctor may adjust these for your baby.
| Item | At one month |
|---|---|
| Vision | Firm face recognition; brief tracking |
| Voice | First coos — answering them is the lesson |
| Strength | Head to 45° in tummy time, briefly |
| Weight (month 1) | ~700 g-1 kg gained; on the MCP card |
| Dates ahead | Week-6 vaccines + mother's postnatal check |
| To ask | Vitamin D drops (400 IU) |
| Mother | The mind's check is part of the check — don't hide it |
When to see a doctor at once
The firm list continues — fever under three months, refusing feeds, fast breathing, lethargy, fits: hospital immediately (108). One more line now: if at a full month the baby startles or stills at no sound at all, or the eyes never rest on any face even briefly — don't wait for the next appointment; tell the doctor.
The mother's list is equally strict: heavy bleeding returning, foul discharge, high fever, one painful swollen calf, sudden breathlessness, or thoughts of harming herself or the baby — for that last one, seek help the same day; it is an emergency, not a weakness, and help works.
This article is general information only and no substitute for personal medical advice. The people who can guide you knowing your baby's health, birth history and test results are your paediatrician or the doctor at your nearest health centre.
Keep the feed and nappy record
When the last feed was, which side next, how many wet nappies today — this tool keeps the record of these weeks' three big questions. Everything stays on your phone.
Every record stays on your phone — nothing is sent to us. Minutes at the breast cannot tell you whether the baby got enough; some babies feed fast. The count of wet nappies and the weight at the clinic — those are the real measures.
- Fewer than six wet nappies a day after day five, or dark yellow urine
- A baby too sleepy to feed, or one who has to be woken for every feed
- Birth weight not regained by two weeks, or weight still falling
- Jaundice that is deepening, or yellow reaching the hands and feet
- A dry mouth and a sunken soft spot on the head
- Until six months, breast milk alone is enough — nothing else, water included. If it feels short, talk to a doctor or lactation consultant before adding formula.
Frequently asked questions
How much does a one-month-old see? Colours?
Sharpest at about 30-45 cm; strong contrast (black-white-red) is still the real attraction. The full world of colour opens over the coming months.
Baby strains and goes red with every poo
constipation? — Straining and grunting with soft stools is not constipation; it is the abdominal muscles learning their job. Hard, dry pellet stools are the thing that goes to the doctor.
What can't a breastfeeding mother eat?
A short list: no alcohol, no tobacco, caffeine in moderation. Everything else in plain home cooking is fine — the 'heaty foods' prohibition lists are tradition, not evidence. If one specific food visibly troubles the baby every time, drop that one after asking the doctor.
One month done
can we take the baby out to show everyone? — Small, open, low-crowd occasions are fine; enclosed crowds (function halls, markets, hospital waiting rooms) are best avoided until the first vaccine round. Whoever holds the baby — the same old rule: washed hands, the unwell at a distance.
Sources
Every clinical figure on this page is taken from the guidelines below. Where our numbers and your doctor's differ, ask which guideline they follow.
- IAP. IAP Immunization Timetable 2024–25 (2024)Backs the six-week vaccine schedule listing Penta-1, OPV-1, Rota-1, PCV-1, and fIPV-1 as the first immunisation round.
- WHO. Family Planning: A Global Handbook for Providers (2022)Backs the claim that breastfeeding is not guaranteed contraception and that pregnancy is possible before the first postpartum period returns.
- NICE. Postnatal Care (NG194) (2021)Backs the six-week postnatal check covering physical recovery (stitches, uterus, BP) and mental health screening for postpartum depression, and the red-flag signs for mothers (heavy bleeding, foul discharge, high fever, painful swollen calf, sudden breathlessness, and thoughts of self-harm).
- WHO. Guidelines on Physical Activity, Sedentary Behaviour and Sleep for Children Under 5 Years of Age (2019)Backs supervised tummy time as a recommended daily activity to build neck and upper-body strength in infants from birth.
Reviewed by
- Nakul Phatak — CEO, theAsianparent India & IndonesiaHead of theAsianparent India; father of one
- Roshni Chugani — Head of Marketing, theAsianparent India & Singapore12 years in the mother-and-baby space; mother of two
Published by: theAsianparent editorial team
