the baby is not likely to get the proper nutrition that would be supplied by the same volume of formula or breast milk. i am not a big fan of thickening formula with cereral. after a baby is six months old they can have cereal but it is bettter to feed them with a little spoon so that they learn how to eat (they already no how to suck).
what happens if you feed four month old cereal in every bottle. what could happen if you make a thick cereal bottle every time for a four month old baby?