PLEASE don't touch my baby!

I will never understand why strangers think it's okay to touch someones child. I was in Barnes and Noble the other day and a lady came up to us and went to touch My baby, not her arm or somewhere thats covered by clothing but her face. I literally jumped back from this woman so her hand wouldn't come in contact with my child. This isn't the first time it's happened either, almost every time we go out something like this has happened, NOT OKAY. I'm not coming up to you and trying to touch your face. My baby isn't even a month old. I wash MY hands before I touch her when I'm out in public, god only knows where your hands have been. I have no problem when someone comes up and wants to look at her or ask how old she is, I'm proud as hell of her, I can talk about her for days but PLEASE don't touch my baby.