| Infants, Toddlers, & Kids | ||||||||
| Size (approx) | Alpha | 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 | |||
| 2 | XXS | 31-34" | 26-29 lbs | 1-2 yrs | 20 1/2 | 20 | ||
| 3 | XXS | 34-38" | 29-33lbs | 2-3 yrs | 21 | 20 1/2 | ||
| 4 | XS | 38-42" | 33-37 lbs | 3-4 yrs | 22 | 21 | ||
| 5 | S | 42-45" | 37-43 lbs | 4-5 yrs | 23 | 21 1/2 | ||
| 6 | S | 45-48" | 43-50 lbs | 5-6 yrs | 24 | 22 | ||
| 7 | M | 48-51" | 50-57 lbs | 6-7 yrs | 24 3/4 | 22 1/2 | ||
| 8 | M | 51-54" | 57-67 lbs | 7-8 yrs | 27 | 23 | ||
| 10 | L | 54-57" | 67-75 lbs | 8-9 yrs | 28 1/2 | 24 | ||
| 12 | L | 57-60" | 75-85 lbs | 9-10 yrs | 30 | 25 | ||
| 14 | XL | 60-62" | 85-100 lbs | 10-11 yrs | 31 1/2 | 26 | ||
How to Measure Kid and Toddler Sizes:
 | Height | Stand child with feet slightly apart and their back to a wall. Measure from the floor to the top of their head for height. Measure child without shoes for best results. |
| Chest | With arms relaxed at sides, measure child around the fullest part of their chest. Keep tape measure parallel to the floor. | |
| Waist | Standing straight up, measure child's natural waist. Keep tape measure comfortably loose and parallel to the floor. |
How to Measure Infant Sizes:
 | Height | While lying down and legs extended, measure infant from top of head to bottom of feet. |