What do you do when people try to touch your baby?

I’m a first time mom to a 6 month old, and I’m just completely shocked at how often complete strangers try to touch my daughter - her face, her hands, her feet, her arms, her thighs, anything they can reach.I have fully taken steps backward when someone was approaching us, and they freaking followed me and grabbed her headband.I also had someone sneak up on us and touch her face, making her choke on her bottle.It would be seriously inappropriate for me to touch them or their older children, so WHY do they think it’s okay to touch my baby?Anyway, I’m struggling with finding my “mom voice” here. I want to be adamant and get my “don’t you dare touch my baby” message across, but I also don’t want to be unnecessarily rude.Do you have a go to one-liner that’s nice but also says back the eff up?Thanks! via /r/Parenting http://bit.ly/2VWbF3N