In OOTP, Hermione says,as we all know, "you can't hurt a baby." when harry is going to attack that death eater whose head is a baby.
Well, i've just re-read that book, (for the 100000th time) and it stuck out at me. Was hermione just being motherly? Or was she saying it for reasons we don't know. The whole group, (Harry, Ron, Hermione, Neville, Luna and Ginny) all got weird in the Department, so maybe Hermione had a reason for saying that.
Also, if hermioen had read something that said you couldn't hurt a baby, that might have something to do with Harry's attack when he was a baby. I mean, of course the fact that his mother died to save him meant something, but maybe the fact that Harry was an innocent baby had soemthing to do with it.