All right, experienced moms, I need your help! My son is 4 1/2 and still wakes up with a super-full diaper every morning. (even though I limit his liquids in the evenings) I've read that 5 dry morning diapers in a row is a sign of "readiness" for nighttime potty training...if I go by that definition, my son is nowhere near ready! My pediatrician says there's no reason to worry yet...6 and 7 year olds who can't hold it at night are worrisome but not 4 and 5 year olds. Is that really true?? Then why is it that there are so many 3, 4, and 5 year olds out there who are totally nighttime trained?? Should I try to "force" the issue now and start night-training him, or should I wait til the magical "5 dry morning diapers in a row???"