Enfamil Gentlelease

Hi mummies, I have recently started mixed feed for my 7 months old. I got Enfamil Gentlelease and noticed that she had also had a very coarse voice after that. Doesn't seem to bother her much, went to the PD and was told that her throat is not sore. Is it because enfamil is a very heaty fm? She is prone to vomits and gassy tummy. What other FMs would you recommend?