I have a DS5 and he had a friend over the other day, a little girl who is 5 also. They were playing in his room with the door shut (I have never had an issue with this before) but when I went in (I knocked then opened the door) to say their tea was ready, my son was very flushed and just looked at me and said "Nothing, nothing's going on." Without me even asking. Then as I got to the foot of the stairs, the little girl (at the top) pulled down her knickers and quite explicitly exposed herself to me. I brushed it off and said "No thank you (name), that's yours and I don't want to see it." My little boy then whispered to her "I thought we weren't going to tell anyone!"
Now I know kids get very inquisitive at this age and apparently the little girl (according to her mum) has known where her bits are (clitoris in particular) for quite some time now and she seems to know about the 'fun' it can provide and does so on a regular basis. My little boy looked so embarrassed and I laughed about it to my husband later on but I did feel ever so slightly heart broken that he is now 'at that age' i.e. he is no longer my baby. I am assuming that it was merely 'show and tell' and I haven't mentioned to my son and he hasn't mentioned anything either. I don't want to draw attention to it unnecessarily. Does anyone think this is normal at the age of 5?