Aquaphor Baby Healing Ointment
A barrier ointment thin enough to use at every single change, which is what actually prevents rash. Also fixes cracked knuckles, dry cheeks and your own hands.

This is the cream a lot of parents grew up with, and it still works the same simple way: zinc oxide and dimethicone to protect the skin while soothing aloe helps calm irritation. Use it right when you first notice redness so it can get to work before the rash sets in.
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Catching a rash early, at first sign of redness
it's a wash, dry, apply routine, and the formula is non-greasy and spreads easily, but it is not labeled fragrance-free or organic
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