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.

40% zinc oxide — the strongest you can buy without a prescription — in a paste thick enough to stay put for up to 12 hours. Visibly calms a raw rash overnight.
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A rash that's already red and sore
Deliberately thick and hard to wipe off. That's the point; don't fight it, just layer it on.
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