LO is 14 months and sleeping 11-12 hours a night, lately he's been soaking through about 30% of time. I'll find a soaked diaper and big wet patches on his belly on his onesie and his footie pjs because he sleeps on his stomach. He wears Pampers Swaddlers at night, maybe we need to switch? I don't think sizing up would help since size 4s are pretty big on him already.