When baby pee, the urine will be absorbed by training pants, he will feel uncomfortable because the cloth of the training pants is wet. he will cry to let mommy to replace it for him, and elder baby maybe can take off the pants by himself, after a period of time, baby will learn to pee independently. Features - Size: XL(more details see the Product Parameter) - Material: Outer layer: Cotton (soft, breathable,extensile,comfortable, with animal print.) - Middle layer: TPU ( environmental, non-toxi, soft, baby care) - Inner layer: 85% Cotton, 15% Polyester(water absorption) - Leg: elastic band ( flexible, very close to thigh to prevent leakage of urine) Pants ParametersSize/HeightAge(month)Weight(kg)Length(cm)Waist(cm)Crotch Width(cm)Thigh(cm)M/80CM6-158-102221*21211.3*2L/90CM15-3211-162322*21312*2XL/100CM18-3615-202423*21413*2 Notes 1). If baby pee a lot, this training pants also leak, pls using it with inserts. 2). It can not replace regular diaper completely, only as a transition supply to make baby learn to pee independently. 3). Suggest you order 6+ pieces training pants as replacement. 4). Elastic band of the leg opening is effective to prevent leakage of urine, to avoid hurting your baby thigh skin, we suggest you to select bigger size for your baby if you baby is overweight.