S.
We talked to our doctor who reminded us that boys' bladders all develop differently. Don't put too much pressure on him and don't drive yourself crazy by washing sheets every day. Our oldest son just turned 7 and is still wearing Good Nights to bed even though he has been trained during the day since he was 3. Our younger son, was night trained by age 4. If he is only 4, you need to buy some Good Nights. We call them Good Night Undies and our 7 year old puts them on right before bed. He is now dry most nights and we just talked to our doctor again who said we might want to check into an alarm if his body doesn't regulate itself in the next few months. Good luck.