We did the switch and Liam didn't even notice ... They had told me to try half and half in the beginning.

@valrocks, so I heard, I'll wait to see the doctor then. I know enfamil has less calories and that's why they give Similac in hospitals so they can gain weight. My daughter went from 4lbs to 8lbs in a month being on Similac and she likes it

But I would consult with your pediatrician before you do anything.

They say enfamil is better. My son is on the gentlease