My baby’s diaper is still leaking

I was the one that asked for advice because my baby was wearing size 2 diapers and leaking non stop. I moved to size 3, leaked the first 2 hours. I continued thinking I’ll just keep trying...I just had to strip her down because she soaked her night clothes...she was sleeping so good till she started to squirm from the pee....crazy thing is that her diaper was not even that full...I’ve been using huggies for her since she was 3 weeks...never had this leaking problem...should I now move to size 4....cuz this is getting ridiculous.. pampers gave her a rash. I ordered over night size 3 huggies...yet to be delivered