It is normal for babies to lose some weight in the first few days after birth, as they pass extra fluid and start feeding. Knowing what to expect can be reassuring.
How much weight loss is normal?
Many newborns lose around 5 to 7% of their birth weight in the first days. Loss of 10% or more is a sign that feeding needs to be checked and supported. Weight usually stops falling by about day 3 to 5.
When do babies regain their birth weight?
Most babies are back to their birth weight by about 10 days to 2 weeks old. After that, babies typically gain weight steadily in the first months.
Signs your baby is feeding well
- Feeding at least 8 times in 24 hours in the early weeks
- From about day 5, at least 6 heavy wet nappies a day
- Poo changes from dark meconium to yellow by around day 4 or 5
- Your baby seems content after most feeds and is alert when awake
When to get help
Contact your midwife, health visitor or doctor if your baby:
- has fewer wet nappies than expected or very dark urine
- is very sleepy and hard to wake for feeds
- looks more yellow (jaundice), especially in the first 24 hours or after 2 weeks
- has not regained birth weight by 2 weeks
If you are breastfeeding, a feeding specialist can help with positioning and attachment.
Track your baby’s growth with our Baby Growth Percentile Calculator.