Can changing brands of formula cause diaper rash?
Yes, changing formula can cause diaper rash. If it's a really bad rash, I would also consider whether yeast might have gotten in the rash. Almost all diaper rashes that have gone on for two weeks have become complicated by a yeast infection, and may not clear up without treating the yeast.
The switch from one formula to another might cause a brief diaper rash but wouldn't be expected to cause anything prolonged. A switch from soy to cow's milk formula or vice versa might. Lotrimin is a good over-the-counter cream for a yeast diaper rash. A diaper rash that doesn't clear up after being treated for yeast should be checked by your physician.
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