i'd recommend california baby calendula cream. very good for rashes and eczema! works wonders. you can give it a try. once, my 2nd born had very bad eczema on the cheeks. the meds and cream doctor gave didn't work. doc wanted to give steroid cream but i denied.
i tried california baby calendula cream and it was gone within a week and didn't came back. same goes for my current newborn now, im using that cream. i always apply under the neck after shower, his folds, body and face!
whenever he has rash or heat rash, it will clear very fast.