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Normal weight for 9 month olds



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 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 chart 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 chart 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
  1. 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
  2. American Academy of Pediatrics Is Your Child Overweight?


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