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 3-in-1 pick that prevents, soothes, and treats rash with the same cream, so you are not juggling separate products for daily protection and flare-ups. It comes as a multipack, so you have backups on hand without running out mid-rash.
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Mild to moderate rash, day to day use and stocking up
It is formulated for mild to moderate diaper rash, not the heaviest-duty option if things get severe
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