Seborrheic dermatitis babies?

Chevy

Since Ava was about 2 weeks she has had seborrheic dermatitis on her cheeks, arms, back and legs. We have tried different lotions and shampoo prescribed by the doctors. Coconut oil, baby oil and changing my diet and still the rash stays. The doctor gave us a referral to see a dermatologist but their next available appointment isn't until end of November. The rash doesn't seem to bother her a lot, but there are times she will continue to scratch at it.

Does anyone else's baby have seborrheic dermatitis? What do/did with it?