My son turned 3 in December. He wears "big boy" underwear and uses the potty at daycare all day (when he has to pee). He saves the rest for when he gets home. As soon as he gets home he asks for a diaper so he can go # 2 and then once he gets changed, he wants another diaper and won't use the "big boy" potty for the rest of the night. When he's home on weekends, he also will only go in a diaper (both # 1 & 2 all day). If I try to put underwear on him so he has to go pee in the potty, he will just go pee in his pants. What am I doing wrong or what can I do differently? Or is he just not ready? Is he a little old for this?