Who are all these kids, and why do they keep calling me mom?

I stopped and looked around myself this weekend and felt some shock and awe.  My kids are getting so BIG, right before my eyes.  Big as in, they will concievably be taller than me one day.  Soon.  Probably tomorrow, the way things seem to be flashing before my eyes.

Weren't they babies, like yesterday?  And now all of sudden, they are ... people.