Hello T.,
As, you already know children are very different. My first born daughter who is now 5 years old, had to be changed fromulas serval times until we found the right one. I was in the WIC program as well, so the cost was from the government. Well, my daughter had colic and acid reflux really bad so they put her on nutraimgen. It is really expensive and it has a smell also. After awhile, my daughter did good on it. AS of now she doesn't have acid reflux and is doing well.
My second born daughter who is now 3 years old well she didn't have any problems on formula. but, she is delayed and was born with a catract. But, other than that she is okay.
My third baby girl who is now 9 months old had problems with formula. She is now on prosobee. But, we had problems with her but, she is doing okay with the formula now. I hope everythign works out with your child. Gl.