Baby cereal-

Clarissa • Mama
Is there like a brand I'm supposed to use? Will our ped tell us what to give? Is this even a thing people still use? My only experience with babies (babysitting) turned 16 this year- so I don't even know!!
If I get to pick- what kind did you/do you use?!
My baby is allergic to cow's milk AND has terrible reflux if that makes any difference?? 
FTM please be nice :)