Growth Charts for Infants With Down Syndrome

Uses the Zemel 2015 growth charts for children with Down syndrome in the United States to report percentiles and Z-scores.

Includes weight, length, head circumference for age, as well as weight for length.

This calculator is for infants from 0 to 36 months of age. For children aged 2 to 20 years, there is a separate web calculator.

There are small differences in the calculations from the Zemel et al 2015 publication supplementary materials, likely due to rounding errors.

Citing: If you use PediTools for a publication or clinical guideline, please consider citing: Chou JH et al., J Med Internet Res 2020;22(1):e16204 (available open access [PDF])




Growth: from 0 to 36 months
Male Female
Age (months)
OR Date of birth
and Date of measure
Weight (kg)
Head circumference (cm)
Length (cm)
Optional: GA at birth

Tips and Tricks

  • Valid ages from 0 to 36 months
  • Weight: grams assumed. To enter pounds and ounces, enter #-#; e.g., 8-4 for 8 lb and 4 oz
  • Head circumference: cm assumed. To enter inches, enter #"; e.g., 19" for 19 inches
  • Height: cm assumed. To enter feet and inches, enter #' #"; e.g., 4' 5" for 4 feet 5 inches
  • Gestational age, enter in the form of ## #/7; e.g., 30 3/7 for 30 weeks and 3 days gestation

Based on