What age do babies stop wearing diapers?

It depends on when you potty train your toddler. Most toddlers start potty training around 2.5 - 3 and are completely potty trained (regular underwear only) at age 4. Yes, it is a long process that needs consistency and support on your part as a parent. Praise your child for doing well, but dont punish for accidents. Remember, its a hard transition from never remembering to use a restroom to always having to remember. Be understanding and supportive.