Diaper help

Ok ladies I need your help, my 3 1/2 month old is 14 lbs now and has slept through the night since 6 weeks she we have always used luvs, well about every morning she wakes up completely soaked all the way up her back. I have a routine I do I change her and feed her at 10 then change her again and lay her down at 6 she wakes up soaked. She is in size 3 already but 4s are wayy to big. Pampers are the same and she is allergic to Huggies. Anyone else having this issue, or a good diaper recommendation!??! Thank you :)