Children sensing pregnancy

Briana
What are your guys take on this? Two children have recently come up to me. One was a special needs child he hugged me then rubbed my lower stomach and said mama. And then my boyfriends niece she is like 7yrs old told me I was pregnant and I told her umm no I'm not. And then she gave me a weird look and said oh, OK and tilted her head and walked away. Lol. But anyways anyone have any stories about children knowing before you knew you were preggo?? Just curious.