My son just turned 6 months and is using size 3 diapers but he is always leaking all the way up his back over night. I stocked up on some diapers form target when they had sales and bought some overnight size 4 diapers. I have been looking for size 3 but they all say no longer available online. My question is should I try the size 4? I’m just really tired of the overnight leaks. I have to change his pjs at least twice. It wakes him up at night when he is wet. I always change him right before bed time sometimes even if he’s barley wet just to prevent it but it still happens.