I found this Bumbo seat + tray on Craigslist and lo and behold even Caitlin fits in it-! (I bought it for Connor.) And this is her face when I say, "Show me your teeth!" (much less abstract (and much more effective lately) than, "Smile!")
Caitlin sat down and read to Connor the other day and conveniently used his head to help prop her book up... (this is why Mama stays around to monitor playtime...)...at least he doesn't seem to mind-!