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.

If you'd rather avoid phthalates, parabens and SLS, this one skips them while still handling diaper rash, dry skin and chapped lips. Coconut oil and beeswax form a barrier to lock in moisture, so it doubles as a daily lotion, not just a rash treatment.
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Everyday face-to-toe moisturizing with a natural ingredient list
it's positioned as a full body and face moisturizer as much as a rash cream, so if you want something purely for tough diaper rash, this may feel more general-purpose
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