J.F.
What I did with my kids is not let them have a drink an hour before bedtime. Now that they are older we don't do that anymore but you don't want him soaking himself. My middle daughter has Autism and is still wearing a pull up so we still limit her drinks before bedtime. Also we ALWAYS make sure my middle daughter is freshly changed before she goes to bed. This way if she goes at night she doesn't soak the bed.
Oh just a thought if your son is wetting through a pull up you way want to go a size up. If he is so close to potty training don't buy a huge pack.
Joanna
Mom to Mara 9, Cate 7, and Olivia 6