I've some big babies giving presentations at mine.
Sorry.
Mine usually has
Kiddie Corp provide babysitting services. Hedgepiglet hasn't gone with me, so I've never used them, but I'm not so sure I would want to. Whenever I've looked in, I've always seen a TV on, with some crappy video playing., but maybe it's not on all the the time. They charge $9//hr (under 6 mo) and $7/hr (6 mo to 12 yr).
I've also seen parents taking their kids around with them, mainly in the exhibit and poster areas, not so much to the talks.