Boys 4.5 kg (9.9 lb)
Boys 54.7 cm (21.5 in)
50th percentile (median) on the WHO Child Growth Standards. Healthy babies vary widely around these numbers.
Development at 1 month
Your newborn is getting used to life outside the womb. Babies this age can focus best on things about 20 to 30 cm away, which is roughly the distance to your face during a feed. They startle at loud noises and grip a finger placed in their palm.
What you might notice
- Lifts their head briefly during tummy time
- Turns towards familiar voices
- Watches faces closely
- Startles at loud sounds
- Grasps your finger
Feeding
Most newborns feed 8 to 12 times in 24 hours. Formula-fed babies often take about 60 to 90 mL (2 to 3 oz) per feed at first, increasing over the month.
Breast milk or formula is all your baby needs until around 6 months. Feed when your baby shows hunger cues, such as rooting, sucking on hands or turning towards the breast. Breastfed babies usually need a vitamin D supplement: the AAP recommends 400 IU a day. Work out formula amounts with our Baby Feeding Calculator.
Sleep
Newborns sleep a lot, often 14 to 17 hours in 24, but in short stretches day and night. Always put your baby down on their back, on a firm, flat surface with no pillows, bumpers or loose blankets. The AAP recommends sharing your room, but not your bed, for at least the first 6 months. Ideas for a gentle routine are in our Baby Sleep Calculator.
Your checklist this month
- Attend your baby’s newborn check, usually 3 to 5 days after birth, and the 1-month visit.
- Check your baby is back to birth weight by about 2 weeks.
- Offer short periods of tummy time when your baby is awake and watched.
- Use a rear-facing car seat for every journey.
Is your baby growing well?
Check weight, length and head size on WHO charts with our Baby Growth Percentile Calculator, or work out your baby’s exact age with the Baby Age Calculator.