Baby Size Height (in) Weight (lb) Preemie (P) 43 2 Newborn (NB) 55 4 3M 55~61 4~6 6M 61~67 6~7 9M 67~72 7~9 12M 72~77 9~11 18M 77~83 11~12 24M 83~86 12~14 36M 86~91 14~15 48M 91~100 15~17   Toddler Size Height (in) Weight (lb) 2T 88~93 13~14 3T 93~98 14~15 4T 98~105 15~17 5T 105~110 17~19   Kid Size Height (in) Weight (lb) 4 102~108 17~18 5 108~114 18~20 6 114~122 20~22 6X 122~128 22~25 7 122~128 22~25 8 128~135 25~28 10 135~140 28~33 12 140~147 33~39 Size Height (in) Weight (lb) XS (2T/3T) 88~98 13~15 S (4/5) 102~114 17~20 M (6/7) 114~128 20~25 L (8/10) 128~140 25~33 XL (12/14) 140~155 33~45