What Does It Mean For Babies To Be Looking Through Their Legs?

Apparently there is a superstition that a baby looking through their legs (kinda up on all fours with their head down) means that someone usually their mother - is pregnant.

Has anyone heard this?
Is it confirmed to be true?
Are there any studies or researches about this?

I’m not superstitious, but sometimes it's fun watching babies doing that.
  

 

SOURCE