Pee Training

My toddler is turning 5 years old this december and yet he still wears diaper at night. How can I train him not to wear diaper even he is still drinking milk at bottle at night. He drinks 2 bottles before sleep. 1 bottle at midnight. 1 bottle at 5-6am. Or? maybe this is the reason why it is not possible for him to be trained. #advicepls #dedeislife