Formula reaction Help?!

Hello ladies! I need help, so ive been trying to find the right formula for my bub. She is nearly 5 months old. She has a very sensitive tummy, gassy and green poops. always straining. so we tried this NAN comfort, after 2-3 days i noticed a reaction she got some rashes on her back and face. I am not sure what this means? Is it because of cowsmilk? or what? Im a first time mum. Thanks for your help in advance!

red rash on her eyebrows

on her back and behind her ears. camera isnt showing it very well but its more visible in real life.

noticed those reaction after using this formula NAN comfort