Is this all in my head or not?

i was holding a baby and she put her hand on my collar bone adn started rubbing on that squishy part and about two or three inches lower (I KNO IT WAS JST A BABY AND I KNO IT WAS NOTHING WEIRD DONT THINK THAT FOR A MOMENT) thats not my question yes at first it freaked me out becuz i didnt kno it was her i was looking somewhere else then i realized it was her and shes a baby lol she touches everything but i think her mom (a rly good friend of mine) saw that it made me feel weird (for a moment) should i let it go (i havnt talked to her since but a little on fb and she is acting normal) idk kno wat to do should i bring it up or let it go(this was like 2-3 days ago)