Re: when should I get rid of night diaper?
My son is 7 and still wears a pull up at night. We've talked extensively with our pediatrician about it (he was fully potty trained at 2). Our pediatrician is the associate professor as well at a very highly regarded medical school at an Ivy League college.
He told us, simply...it's not harming him...he's a VERY sound sleeper...and his father, and his cousin both wet the bed....and it CAN be hereditary. So, it's wear a pull up, or deal with the mess...there is no training we can do, he does get up occasionally in the middle of the night to go potty, but other than that....he's got dry nights and wet ones.
I chose, pull ups over mess....not just for me, but I didn't want him sleeping in wet mess either :-)
We though, have never had poopies at night....