We switched from Similac Advance to Enfamil Newborn and our baby is happier. He kept spitting up/vomiting the Similiac. He spits up occasionally, but it's gotten MUCH better on Enfamil. He's eating about the same, but he stays full longer.
I am not worried about how much weight he gains at this point...as long as he is healthy. He's gained half a pound in 2 weeks and the doctor is happy with that, a d more importantly, my baby is happy :)