I am not a proponent of giving cereal to babies. When my babies were old enough to pick up things from my plate or started doing that tongue rolling response, their first food was banana. After eating bananas for a while (it's not like they ate it all day and all the time, just when everyone else sat down to eat, the banana was his portion), I started slightly thawed frozen green peas.
The Cheerios type of breakfast cereal became a nice snack, especially when teething. In fact, the cold green peas were a good help with teething, they made the soreness feel better.
Anyway, follow your heart/instinct and your baby's lead is my advice.