Boys
Height: 67.5 - 78.7 cm
Weight: 7.1 - 9.9 kg
The height and weight of a 9-month-old boy are normally 67.5 - 78.7 cm and 7.1 - 9.9 kg
| Height | Description |
|---|---|
| Less than 65.2 cm | Below normal (extremely short) |
| 65.2 - 67.5 cm | Below normal (undersized) |
| 67.5 - 69.7 cm | Normal (below average) |
| 69.7 - 74.2 cm | Normal (average) |
| 74.2 - 76.5 cm | Normal (above average) |
| 76.5 - 78.7 cm | OK (high) |
| More than 78.7 cm | Very tall |
| The weight | Description |
|---|---|
| Less than 6.4 kg | Below normal (extremely insufficient) |
| 6.4 - 7.1 kg | Below normal (insufficient) |
| 7.1 - 8.0 kg | Normal (below average) |
| 8.0 - 9.9 kg | Normal (average) |
| 9.9 - 11.0 kg | Normal (above average) |
| 11.0 - 12.3 kg | Normal (very large) |
| More than 12.3 kg | Doesn't match age |
Girls
Height: 65.3 - 77.4 cm
Weight: 6.5 - 9.3 kg
The height and weight of a girl at 9 months is normally 65.3 - 77.4 cm and 6.5 - 9.3 kg
| Height | Description |
|---|---|
| Less than 62.9 cm | Below normal (extremely short) |
| 62.9 - 65.3 cm | Below normal (undersized) |
| 65.3 - 67.7 cm | Normal (below average) |
| 67.7 - 72.6 cm | Normal (average) |
| 72.6 - 75.0 cm | Normal (above average) |
| 75.0 - 77.4 cm | OK (high) |
| More than 77.4 cm | Very tall |
| The weight | Description |
|---|---|
| Less than 5.8 kg | Below normal (extremely insufficient) |
| 5.8 - 6.5 kg | Below normal (insufficient) |
| 6.5 - 7.3 kg | Normal (below average) |
| 7.3 - 9.3 kg | Normal (average) |
| 9.3 - 10.5 kg | Normal (above average) |
| 10.5 - 12.0 kg | Normal (very large) |
| More than 12.0 kg | Doesn't match age |
You can use the BMI calculator to get a more accurate estimate of your child's age and height.
Learn about the developmental characteristics of a baby at 9 months
