Hi. My Son Is 4 Months Old, I Breastfeed And

Hi.
My son is 4 months old, I breastfeed and try to supplement with formula when I go to work.

The problem is he reacts to the formulas, have tried Nan all the way from regular to hypo to,lactose free. Have also tried other formulas: Similac total comfort, Similac allumentum, and isomyl. He either gets a bad rash, skin patches, or really bad cramps depending on formula.

I worry that he may be allergic to treadmill too, because when I breastfeed exclusively, he tends to have a rash at times.

Please advise. I'm so desperate to help him, but have run out of ideas.right now he is uncomfortable, itchy and sore.

Thank you in advance

Tumi Sekhu