I have an 11 month old DD who keeps waking up wet in the night. She's 10kg and in size 4, we use pampers active fit but have also tried baby dry 4+ with the same result.
The leak is always up the back, and although she does tend to feed a lot at night I don't think it's just because the nappy is getting full. I've had nights where she's woken up for a feed and the nappy has felt empty, then she's done a wee and it's leaked, although the nappy doesn't feel anywhere near full when I change her.
She tends to sleep on her side, but also at times puts her legs up on top of mine (we cosleep). I wondered whether she's channeling it down the back by lifting her legs up!
Has anyone experienced similar and found a solution?