Patrick Dempsey: It's twin boys!

Update September 29th: When asked by the View ladies this morning if his sons are identical or fraternal, Patrick said that he didn’t know. Rosie O’Donnell then asked if there was one sac or two, and Patrick replied two. Because of this, Rosie assumed that the twins are fraternal. According to CBB reader Julie, mom of fraternal twin girls,"in most cases…two sacs and one placenta = identical…two sacs two placentas = fraternal."

CBB reader Hannah writes, "I think the readers are confusing the definitions of identical and fraternal twins. I busted out my Mayo medical reference book and read that there are several types of identical twins, including some that share sacs and placentas. However, the only thing that classifies twins as identical vs. fraternal is that identical twins are formed when one egg is fertilized by one sperm and then divides. Whether or not the babies share a sac or a placenta depends on how late the zygote decides to divide and sharing a placenta can actually be very dangerous and is considered high risk, since the blood flow can often be uneven between the babies and the umbilical cords can become tangled. Fraternal twins are formed when a woman releases two eggs, which are fertilized by two different sperm, thus forming two separate, different babies."

Pregnancy.About.com guide Robin Elise Weiss, LCCE emails, "Hannah is right, I’d just add: About 17% of monozygotic (identical) twins have two internal and external sacs, diamniotic/dichorionic (di/di). The outer sac is the chorion, the inner sac is the amnion. So you can have monoamniotic/monochorionic, diamnioic/dichorionic, monoamniotic/dichorionic, etc."

Thanks to CBB reader Layla.

Update September 20th: Patrick revealed on Regis & Kelly that they are expecting twin BOYS!

Thanks to CBB Readers Ella and Doreen!

Originally posted September 19, 2006:
Grey’s Anatomy star Patrick Dempsey and his wife Jillian, who just announced their pregnancy last week, are expecting twins in late January/early February. The TV doc and his wife already have a daughter, Tallulah Fyfe, who is 4 1/2.

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