Best diaper for runny poop overnight

Hey mummies, my 3month old LO is starting to sleep through the night and he poops a lot as soon as he wakes. Any recommendations for diapers which absorbs very quickly for runny poop and also can store a lot of pee at the same time? I tried drypers and even for fresh diaper, b4 it can absorb the poop already flow out from back. Goonz absorbs really fast but not enough to last with through the night pee + poop. Tried rascal and friends but consistently leak from the thigh area even when its fresh diaper. Currently I am using merries, and it's the best, but baby diaper seems to be like it's exploding after just 6 hours of use + poop. Baby is sleeping longer and longer, so I'm wondering if there are other options? Thanks!