Note to stupid broad (limit your anger until you read the rest of this) at housewarming party: babies are not sluts. You cannot characterize a 6-month old as a slut just because she puts her arms out to the men that pass her by. Babies are awesome and curious and too complicated for your simpleton mind – it is entirely possible that she just wanted to be higher than she was in your cold arms.
Find it in yourself to stop saying moronic things like that, without cognizance of consequences. Two years older, that child might have copied the language. Four years older, that child might have repeated the word at daycare and got in trouble for it (or another child would have been blamed for your stupidity). Six years older, that child might have remembered the slight. Eight years older, that child might have looked in the mirror differently that night. Ten years older, that child might have thrown up their dinner.
Be patient, kind and thoughtful with your words, because words have the ability to hurt. Words have the ability to hurt much more readily than they have the ability to heal (as very often, the words that hurt require actions to heal – thus, acts of kindness). So I say this with all the warmth your words had in them and all the thoughtfulness that I just asked of you: go fuck yourself.