My 6yo is still wearing a pull-up to bed because he wets during the night. He has been toilet trained since 3 and half years old. My nearly 5yo day and night trained within a few months at 3-4 years old but he has the bladder of a camel. My 3.5yo is just day trained but still in pull ups at night.

DS2's developmental paed told me that children lack to necessary cognitive function to hold urine overnight until they are close to 8 years old and that he would never worry about a child still night wetting until they are 10 years old with no signs of it slowing. Then they would investigate urinary issues before they worried about it being a psychological issue. So I refuse to worry about it now. They'll night train when they night train.