Toddler peeing through diaper at night

Li

For the past week our 16 month old has been leaking through his diaper every night. It seems to always be leaking from his stomach on the top/front of the diaper- maybe because he has a round tummy and rolls around/sleeps on his stomach?

We’ve tried both pampers overnights and Huggies overnights, both in a size larger than he normally wears during the day with no luck.

Any tips?