Average Weight for a 8-Month-Old Girl
The average (50th-percentile) weight for a 8-month-old girl is 7.9 kg (17.5 lb), based on the WHO Child Growth Standards. Across the healthy range, most girls this age weighs between 6.3 kg (14.0 lb) and 10.0 kg (22.1 lb).
| Percentile | Metric | Imperial |
|---|---|---|
| 3rd | 6.3 kg | 14.0 lb |
| 15th | 7.0 kg | 15.5 lb |
| 50th | 7.9 kg | 17.5 lb |
| 85th | 9.0 kg | 19.9 lb |
| 97th | 10.0 kg | 22.1 lb |
What's typical at this age
Solids usually start around 6 months, but milk is still the main source of nutrition. Weight gain naturally slows as babies get more active — rolling, sitting and reaching burn energy. Between month 8 and month 9, the median girl gains roughly 277 g.
A percentile compares your girl to other girls the same age — the 50th is simply the middle. Being above or below it is usually completely normal; a baby who has always tracked the 15th or 85th percentile is typically growing exactly as they should. What pediatricians watch for is a sudden change in the pattern, not the number itself.
See your own baby's percentile
Enter your child's exact weight and height for their personal WHO percentile and growth curve.
Open the Growth Calculator →Percentiles calculated from the WHO Child Growth Standards (2006). For information only — not medical advice. If you're concerned about your child's growth, speak to your pediatrician or health visitor. Full disclaimer.