Multiple pregnancies have been in the news the last few years. How does a multiple pregnancy differ in risk and how are twins and triplets different from individually-conceived children? National Geographic Channel will air the 2-hour special “In the Womb: Multiples” on Sunday, January 14th at 7pm CT. We’ll get a preview this hour with Dr. Thomas Pinckert, an expert in high definition ultra sound and high risk pregnancies and consultant to the program.