My LO is throwing up alot , Her ped only has recommended to add cereal in her bottles to thicken the…

My LO is throwing up alot , Her ped only has recommended to add cereal in her bottles to thicken the milk, but doesn't work she still throws up alot. I was wondering what type of formula do you give to your child and does it work ? I wanted to try Gerber Gentel but I don't know if it will affect my baby is i switch her formula