Hi just wondering if anyone has any advice. My DS (23 months) sleeps on his front & leaks a lot at night time. After a bit of trial & error we have found that the only nappies that he won't leak through are pampers baby dry pull-up style in a size 4+. This morning I have been to four different shops all of which had size 4 & 5 but no 4+. Does anyone else use these? I'm worried they have been discontinued! Any other recommendations for leak proof night time nappies?