My brother is 5 and also wears a diaper to bed. I dont think that cutting drinks really makes a difference, we have tried that and he continues to wet. Wetting the bed has also run through my family. Even if my brother takes a 20 min nap he will wet. We dont make a big deal about it because we dont want him to be embarassed, I think with everyone else im my family it stopped around 13-14 yrs old.