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.
Could it be a sign of an milk/soy allergy?