👶 Your 1-Month-Old Baby

Your newborn is getting used to the world: feeding, sleeping and getting to know your face and voice.

Average weight (boy / girl)4.5 / 4.2 kg
Sleep in 24 hours14–17 h, 4–5 naps
FeedingBreast milk or formula only

Development at 1 month

These are things most children (about 3 in 4) can do by this age. Babies born early may reach them later — use their corrected age.

Growth: WHO weight, length and head size

Weight (3rd–97th)Length (3rd–97th)Head (median)
Boys3.4–5.7 kg (median 4.5)51.1–58.4 cm (median 54.7)37.3 cm
Girls3.2–5.4 kg (median 4.2)50–57.4 cm (median 53.7)36.5 cm

Any steady curve within this range is normal; what matters is that your baby follows their own curve over time.

Feeding

Sleep and teeth

Vaccines due at 1 month

ScheduleAgeVaccines
IAP (India)6 weeksDTwP/DTaP-1, IPV-1, Hib-1, Hepatitis B-2, Rotavirus-1, PCV-1
UIP (free, India)6 weeksPentavalent-1 (DPT + Hep B + Hib), OPV-1, fIPV-1, Rotavirus-1, PCV-1

Your paediatrician may group doses differently. Keep the vaccination card safe.

Tips for this month

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Baby Milestones Calculator by Age

See which developmental milestones most babies and children reach at your child's age, what comes next, and corrected age for premature babies — based on CDC milestones.
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Baby & Child Weight Percentile Calculator

Find your baby's or child's weight-for-age percentile on the WHO or CDC growth chart (birth to 20 years), with the z-score, the normal weight range for the age and corrected age for premature babies.
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Baby Vaccination Schedule Calculator (India, US, UK)

Get your baby's vaccination schedule with exact due dates from the date of birth — India (IAP 2025 and government UIP), US (AAP/CDC) or UK (NHS) — and see which vaccines are due now and next.
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Baby Feeding Schedule by Age (Breast, Formula, Solids)

Get a sample daily feeding schedule for your baby by age — feed times, how often, how much milk, and when to fit in solid meals — for breastfed, formula-fed and mixed-fed babies.

Frequently asked questions

What should a 1-month-old be doing?

Most 1-month-olds: focuses on faces 20–30 cm away and prefers your face to anything else; startles at loud sounds; grasps your finger by reflex; lifts the head briefly during tummy time.

How much should a 1-month-old weigh?

The WHO median is 4.5 kg for boys and 4.2 kg for girls; the normal range is wide (see the table).

How much should a 1-month-old sleep?

14–17 h in 24 hours including 4–5 naps.

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