Gender confusion

We were lying in the dark on the bed last night, trying to go to sleep. Summy suddenly sat up, leaned over me (I was pretending to be asleep), stroked my hair gently, kissed my cheek, and whispered "Are you a little boy, mama? Are you a little boy?" I have no idea where that came from and what she meant, but it was pretty hard to keep a straight face and continue to feign sleep.