Hi! My baby took NAN too and have no problem! But there was once that he had heat rash but most likely because of the cats we have at home. Went to poly, doc recommended putting lotion after bath. I use cetaphil, safe for baby :)
My baby took Nan HA no issues tho. I don’t think formula milk will cause heat rash. If heaty usually cause constipation. You can try to clean with warm water and cotton balls after every feed to see if it turns better.
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Anonymous