XS: suitable for bust 41 ~ 52cm, for weight 4 ~ 7kg,

S: suitable for chest 46 ~ 61cm, for weight 6 ~ 14kg,

M: suitable for bust 50 ~ 65cm, suitable for body weight 13 ~ 23kg,

L: suitable for chest 65 ~ 81cm, suitable for weight 23 ~ 30kg,

XL: suitable for chest 70 ~ 93cm, suitable for weight 28 ~ 40kg,

XXL: suitable for chest to 82 ~ 113cm, suitable for weight 40 ~ 70kg,