13 Month Baby Weight & Height: WHO Growth Standards & Percentiles
Reviewed by Dr Abhas Gupta, MBBS, MD, DNB (Paediatrics), PDCC (Paediatric Rheumatology) • About Dr Abhas Gupta (Bio) • Last reviewed: 16 October 2026
Compare your 13-month-old baby's weight and length against official World Health Organization (WHO) international growth charts. Calculate exact Z-scores, track monthly velocity, and plot their developmental curve channel.
What's normal at 13 months
In the second year of life, toddlers lengthen and slim down as walking and running become central. Toddlers typically gain around 2 to 3 kg across the entire 12-to-24 month window.
Expected monthly weight gain: 150 to 250 grams per month
WHO Growth Standards for 13 Month Olds
According to World Health Organization (WHO) multicentre growth standards, benchmarks for 13-month-old infants are:
- Boys Median Weight: 9.9 kg (3rd centile: 8 kg, 97th centile: 12.1 kg)
- Girls Median Weight: 9.2 kg (3rd centile: 7.3 kg, 97th centile: 11.6 kg)
- Boys Median Length: 76.9 cm (3rd centile: 72.4 cm, 97th centile: 81.5 cm)
- Girls Median Length: 75.2 cm (3rd centile: 70.3 cm, 97th centile: 80.2 cm)
Normal range at 13 months
| Centile | Boys Weight (kg) | Girls Weight (kg) | Boys Length (cm) | Girls Length (cm) |
|---|---|---|---|---|
| 3rd | 8 | 7.3 | 72.4 | 70.3 |
| 50th (Median) | 9.9 | 9.2 | 76.9 | 75.2 |
| 97th | 12.1 | 11.6 | 81.5 | 80.2 |
Vaccines due at 13 months
12 Months visit: JE dose 2 (only if advised in your area).
Feeding stage at 13 months
Toddler Family Table Meals (12–24 Months): Full transition to wholesome family meals with mild spices, legumes, seasonal vegetables, whole animal milk in an open cup, and healthy fats.
Calculate Your 13 Month Old's Percentile
Frequently Asked Questions for 13 Month Olds
Is 7.3–11.6 kg (girls) or 8–12.1 kg (boys) normal for a 13 month old baby?
Yes. According to official World Health Organization (WHO) Child Growth Standards, the healthy normal range (3rd to 97th percentile) for a 13-month-old boy is 8–12.1 kg (median: 9.9 kg), and for a 13-month-old girl is 7.3–11.6 kg (median: 9.2 kg). A baby tracking steadily along any channel within this window is developing normally.
How much weight should a 13 month old gain in a month?
According to WHO growth velocity benchmarks, a healthy 13-month-old baby typically gains about 150 to 250 grams per month. Weight gain velocity slows naturally across the first year as mobility and activity increase.
When should I worry about my 13 month old's weight?
Consult your pediatrician if your baby's weight sits below the 3rd percentile (8 kg for boys, 7.3 kg for girls), crosses two major percentile lines downward over consecutive months, or shows zero weight gain across two consecutive clinical checkups.