Most babies will control their excretion by themselves when they are 18-24 months old. At this time, they can start toilet training for the baby. When the baby can understand the instructions of the adult and can go to the bathroom by himself, you can stop using diapers. 

4. What to do with the total side leakage of diapers

You can choose a diaper with a double leak-proof partition design for your baby. There are raised frills on the inner thighs and leak-proof frills at the waist. Such diapers can effectively prevent side leakage when the baby has too much urine. In addition, if the diapers are too large or too small, they will also cause side leakage. Moms and dads should choose diapers of the right size.