My son was out on Nutrimagin last month due to FTT. He was EBF but was the same weight at 4 months that he was at 2 months so the pedi wanted us to supplementing. He was on Similac Sensitive but was having mucus in his diapers and spitting up a lot more so the Pedi switched him. But ever since he has been put on formula he has stayed with a diaper rash. The Pedi said it's not a sign of an allergy but I think it is. He doesn't show any signs of having a allergy (my other two kids were on Neocate, I know what to expect from MSPI). I haven't switched any products either. He is 12 lbs 10 oz at 5 1/2 months.
My daughter has a milk protein allergy, and until we figured out what it was, she had a completely raw bum (like you describe - blistering). We ended up finding relief by mixing (I ended up making batches in a small tupperware) equal parts Aquaphor, Neosporin and Desitin at our pedi's suggestion. That, along with change in diet and leff frequent BM, finally had her feeling better. Good luck.
What brand of diapers are you using? We had this until we figured out she was allergic to most diapers. To test it we switched to 7th gen for a week. Cleared right up.
We found walgreens diapers, kroger diapers, 7th gen, whole foods and other "natural" brands were fine.. huggies (most - of them anyway) and all pampers caused the rash.
Re: Allergy and diaper rash
DS1 2-26-07
#4 Due May 2015
IT'S A BOY
DS1 2-26-07
#4 Due May 2015
IT'S A BOY
DS1 2-26-07
#4 Due May 2015
IT'S A BOY