Diaper Rash

Am

Hey y’all my baby is 10 weeks and the last few days his bum has been pretty sore. We’ve been using the same diapers since birth and I change him as soon as he dirties and slather him with diaper cream. We’ve used both penaten and boudreauxs or whatever that one is called. Any tips or tricks?? He’s so sore I feel super super bad!! I’m combination feeding and slowly working up to half formula before I go back to work - same formula and My diet hasn’t changed at all