Normal weight for 9 month olds (lbs)
The average weight for 9 month old baby boys is 20.9 lbs and 9 month old baby girls average 19.2 lbs1 The tables below show the distribution of weight by percentile of the 9 month year old population.
Current units = pounds. View this page in kilograms.
9 month old girls under 16 lbs or over 22 lbs and 9 month old boys who weigh less than 17 lbs or more than 24 lbs may want to consult with a doctor. The American Academy of Pediatrics recommends that children who's weight is outside the 5th or 85th percentiles seek professional advice to determine if further evaluation is needed2.
Body weight percentile table for 9 month old baby boys
| Percentile | Weight |
|---|---|
| 3rd | 17 lbs |
| 5th | 17.4 lbs |
| 10th | 18.1 lbs |
| 25th | 19.4 lbs |
| 50th | 20.9 lbs |
| 75th | 22.5 lbs |
| 90th | 24.2 lbs |
| 95th | 25.2 lbs |
| 97th | 25.9 lbs |
Body weight percentile table for 9 month old baby girls
| Percentile | Weight |
|---|---|
| 3rd | 15.6 lbs |
| 5th | 16 lbs |
| 10th | 16.6 lbs |
| 25th | 17.8 lbs |
| 50th | 19.2 lbs |
| 75th | 20.6 lbs |
| 90th | 22 lbs |
| 95th | 22.9 lbs |
| 97th | 23.5 lbs |
Source Citations
- Robert J. Kuczmarski Dr.P.H. et al., Centers for Disease Control and Prevention, U.S. Department of Health & Human Services 2000 CDC Growth Charts for the United States: Methods and Development
- American Academy of Pediatrics Is Your Child Overweight?