My 4 year old had this too when she was 3. I think even little girls have a bit of discharge, but nothing too significant. I wondered about it, but didn't worry too much until she started telling me her "pee pee" hurt (this was about a year ago). I did have to look down there to check it out, and I noticed she was pretty red. I talked to her doctor's office and at first I was told to try Vagisil cream, which took the redness and pain away overnight, but I ended up having to use it frequently. After a while, she still complained of the soreness and said her butt itched a lot. I checked her out (which I had begun to do frequently after I initially noticed the redness so as to make sure she was not getting worse). Then I noticed more white stuff actually on her, she was more red than before and it was getting a little worse in her panties so I took her to see the doctor. At this point she in fact had a yeast infection. That was a long explanation, but I wanted to make sure you knew the chain of events that we went through before she had a yeast infection. The doctor recommended medicated cream three times a day for one full week. We purchased the Monistat equivalent at Walgreens and it worked well. She hasn't had another infection, but has complained of redness/soreness and then I apply the cream again. My advice is to call the doctor the first time she complains of soreness/redness The stuff in the undies that you explain right now I think is normal, as long as it doesn't get thicker or the odor doesn't get worse. Good luck - this was an ordeal for us and I hope your little girl doesn't get uncomfortable. We had some very hard nights with her screaming it hurt so bad - even I cried at having to apply the ointment. Of course by that we were seeing the doctor. I hope this information helps you. Good luck!