Infants, Toddlers, & Kids
Size Height in Inches Weight in lbs Chest in Inches Waist in Inches
Newborn up to 18" up to 7 lbs up to 15  up to 15
0-3m 18-22" 7-11 lbs 15 - 16 1/2 15 - 18
3-6m 22-25" 11-15 lbs 16 1/2 - 17 1/2 18 - 18 1/2
6-9m 25-27" 15-18 lbs 17 1/2 - 18 18 1/2 - 19
9-12m 27-29" 18-22 lbs 18 - 18 1/2 19
12-18m 27-31" 18-26 lbs 18 1/2 - 19 1/2 19 - 19 1/2
18-24m 29-33" 22-29 lbs 19 1/2 - 20 1/2 19 1/2 - 20
2T 31-34" 26-29 lbs 20 1/2 20
3T 34-38" 29-33lbs 21 20 1/2

How to Measure Infant Sizes:

Measuring Guidelines for Infants Height While lying down and legs extended, measure infant from top of head to bottom of feet.