Leak, due to sleeping position.

May be u have to change the diaper size n also better to wear it properly as I wear my boys diapers n hvnt kept his penis properly it leaks due to its in upside direction n while wearing it put down n centre then it didn’t leak out

Is the diaper too big for him ? My LO use Merries too , but it does not leak . He sleeps on his tummy too . I think u have to check on his weight and size of the diaper

Change diapers! My Daughter is 2 and she uses MamyPoko. No problems with leakage

Could the size of diaper be too small to hold the pee?

I'm using goon diapers and so far so good for my LO :)

I think you got to change the size of the diapers.

My bil & sil recommend Peek a poo

Try another size and brand

I use Drypers and it helps

Tried out other diapers