When can babies eat Cheerios
I think at about the six month mark, we started offering Cheerios and other cereals. As well as being real food, it also helps babies develop their pincer skills. Baby may not be able to get the Cheerios in his or her mouth at first, but it will come eventually.
My personal preference is to use baby cereal puffs instead of Cheerios, though--they melt faster in the mouth, and my daughter choked on them less because of that. My favorite brand was Happy Baby for the lower sugar content, but Gerber and Plum also make great versions.