I'm cross-posting with the general vaccines forum because on second thought this might be the better place to ask this.
The little girl (8 mo) I babysit had a bandaid where she had a shot the other day, so the subject came up with my almost 3 yo DD. The baby's mom was right in the next room, so I didn't want to say anything that might sound judgmental. I told her the dr gave her a shot, and of course she wanted to know why, and all about how, etc. I told her that they put medicine in a needle and have to poke it through the skin to get it into her body. When she wanted to know why, I said that they are "supposed to keep you from getting certain 'bugs' (illnesses)." It didn't get much farther than that, but then a song came on a kids' CD we were listening to about a kid at the dr wanting to know if they were going to give him a shot. Maybe I am just paranoid because I don't know how to answer her questions, but I could have sworn she was picking up on that as well. I managed to divert her attention back to the puzzle we were working on, but I'd like to have some better things to say to her.
Oh and BTW, DD hasn't had any shots since she was 10 weeks old, although she did have her blood drawn and some finger pricks that I don't even think she remembers.