They can be used for trained baby, but it is recommend to use a cloth diaper inserts to give added absorbency during the early stage of potty training which baby has more accidents Could training underwear full replace diapers or pull ups? No, they do have some protection but cant full replace diapers. They are designed for daytime use to prevent a puddle on the floor and teach baby to potty training. It is better to use them for daytime and use diapers for night time. Please use with diapers pads at night Do training pants have padded liner to prevent leakage? Yes, TPU inner layer helps to hold small accidents and prevent leakage. Elastic band for side leakage, giving you enough time to change them.