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.

When you need something that treats a rash rather than just guards against one, this is built for that job. It combines 12.8% zinc oxide with oat extract and beeswax, and it's recommended by pediatricians for treating mild to severe rashes, not just preventing them.
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Treating an active rash, from mild to severe
it's a medicated ointment, not a light everyday lotion, though the listing says it's gentle enough for daily use
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