1 Month Old Baby: Milestones, Weight & Diaper Size
Feeding on demand, lots of sleep and lots of diapers. Keep the cord stump dry until it falls off.
| Average weight | 4.2 – 4.5 kg |
| Diapers a day | 10–12 |
| Tape diaper size | NB / S |
| Pants size | Not yet: most babies use tape at this age |
Milestones this month
- Lifts head briefly during tummy time
- Focuses on faces 20–30 cm away
- Startles at loud sounds
Every baby grows at their own pace. If your baby was born early, use their corrected age. Talk to your paediatrician if you are worried.
Diapers this month
Most 1 month old babies fit tape diapers in size NB / S. Tape diapers open flat, which is easiest for young babies. Not sure? Use our diaper size chart.
Quick answers
What diaper size does a 1 month old baby wear?
Usually NB / S in tape. Always choose by weight.
How many diapers does a 1 month old baby use?
About 10–12 a day.