Well...I wasn't going to, but I did it anyway.
The other night Colin had been fed and just acting hungry before his bath and bottle. He's been very interested in what we are eating for a while and sits up pretty well in the bumbo so I thought we would give his first food a try. (I was hoping to wait a little longer - closer to 6 months - but he's not really getting much anyway.)
I didn't have any cereal on hand so we went straight to sweet potatoes. He opened his mouth right away. Of course, most of it came out with all of the drooling that he's doing right now, but he loved it.