My 18 mth old has discovered her private parts. She spends most of her day naked because of potty training. I often catch her sticking her finger in there. I don't want to make her insecure by fussing but I am unsure what should be allowed and what shouldn't. She isn't trying to gain pleasure or anything, it simply like any other hole in her body. So what do I do? Nothing? Or should I say something?