A one-size diaper that can be used from birth. The size can be adjusted according to the baby's body size, which is very economical and practical. Designed with a three-layer structure, it can be washed repeatedly without deformation, damage, or fading, and can prevent urine leakage. The outer layer is compounded with a TPU film with waterproof and breathable function, which has high elasticity and tensile resistance, can be stretched, and has good flexibility.