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