Masturbation

I read a article not to long ago about child masturbation. Has anyone’s baby discovered themselves and you have noticed they “play” often? I have noticed with my daughter that she has recently been laying on her stomach dry humping in a sense, and sometimes she will put something under her like her blanket. I CANT stand the thought of this! It grossed me out. Especially when she does it in front of others. I know they probably don’t think anything of it but I do and I embarrasses me. She doesn’t ever do it for long but I have also noticed that sometimes when I’m holding her like with her stomach against me she will wiggle her bottom around with her hands in that area I have also noticed sometimes when she’s playing she will lay down on her back and put toys in between her legs. Could this be happening at such a young age? Do I do something? What if it gets worst? I used to be a preschool teacher and have seen kids do it non stop but I don’t want her to be like that! What do I do? Can they really feel something this young?! HELP! Please tell me this isn’t only happening to us! What do I do?!?!