Size / Age Height Weight Chest Waist Hip Preemie Up to 48 3.5kg 33 36 36 0~3 Months Up to 53 Up to 5.5kg 41 43 43 3~6 Months 53 ~ 61 5.5 ~ 8kg 44 46 46 6~12 Months 61 ~ 71 8 ~ 10 kg 47 48 48 12~18 Months 71 ~ 89 10 ~ 12 kg 50 50 51 Size / Age Height Weight Chest Waist Hip Small / 3 Years 86 ~ 97 14.5 ~ 16 kg 55 52 56 Medium / 4 Years 97 ~ 107 16 ~ 18.5 kg 58 54 59 Large / 5 Years 107 ~ 117 18.5 ~ 23kg 61 56 62 X-Large / 6 Years 117 ~ 127 23 ~ 26 kg 64 58 65 XX-Large / 7 Years 127 ~ 137 26.5 ~ 29.5 kg 67 60 69 XXX-Large / 8 Years 137 ~ 147 29.5 ~ 32 kg 70 61 72 Size / Age Height Weight Chest Waist Hip Small / 3 Years 86 ~ 97 14.5 ~ 16 kg 55 52 56 Medium / 4 Years 97 ~ 107 16 ~ 18.5 kg 58 54 59 Large / 5 Years 107 ~ 117 18.5 ~ 23kg 61 56 62 X-Large / 6 Years 117 ~ 127 23 ~ 26 kg 64 58 65 XX-Large / 7 Years 127 ~ 137 26.5 ~ 29.5 kg 67 60 69 XXX-Large / 8 Years 137 ~ 147 29.5 ~ 32 kg 70 61 72