Took ours to the 12 week one (at around 2yo), she practically screamed the house down. We got a close park to the hospital, made the mistake of taking her in her stroller, and we're just not allowed to take her for such a short walk in the stroller apparently. The ultrasound person was NOT happy.

So we didn't take her to the 20 week one.

I also don't take her to my regular checkups, we do sometimes take her to the doc when we both need to go for something, but she really hates the doors in there being closed on her so you have to wait 5 minutes for her to stop screaming and (literally) hanging off the doorhandles before you can speak. She's getting better now she's older - we had a reputation at the hairdresser too, it took 2 of us holding the screaming toddler down to get her hair cut, and she needs her hair cut quite often. Now she just happily sits there and everyone comments on the cute ball of golden fluff.

Needless to say, there's a darn good reason I don't want her at the birth - I want the doors SHUT and she really has an objection to strange places with closed doors.