Another amazing National Geographic show

Clear your calendar this Sunday night, December 21 at 9:00 p.m. ET for the premier of National Geographic Channel's In The Womb: Identical Twins.

Yesterday I was lucky enough to see an advance copy and I was amazed by just how different identical twins can be, and why.

You can see the moment when a single cell rapidly multiplies into a blastocyst and see the many milestones as identical twins grow in-utero. Learn what happens when one identical twin doesn't fully develop, and why identical twins are not always subject to the same diseases.

My twins are obviously not identical but like most people (with or without twins) the idea of 2 identical children is fascinating. National Geographic covers several sets of identical twins including 2 boys one of whom weighed 6 1/2 pounds at birth while his 'identical' brother weighed just over a pound. Another set of twins had no contact with each other for 40 years and yet lead parallel lives.

Plus, the show explores what behavior is a result of nature versus nurture and how scientists can study the effects of genes on someone's personality.

The 4-D ultrasound is very cool and had me thinking back to my own pregnancy when the Twofer would kickbox each other on that little screen!

The girls really want to watch it and my only hesitation is the c-section part, and the fact that they don't really know how babies are made. I can hear it now, "Mommy? What's sperm and how do you get it?"

But I'd love for them to see what 2 babies inside a mommy's tummy looks like since they are used to hearing me tell stories.

Enjoy the show and I'd love to hear what you thought!.
Janine