Do twins have one placenta or two?
According to this article from BabyCenter.com, either one is a possibility: http://www.babycenter.com/refcap/pregnancy/carryingtwins/3579.html This is the section of the article that talks about the placenta(s): “How and when can I find out whether my babies are DZ or MZ? Prenatal tests such as chorionic villus sampling (CVS) and amniocentesis can tell you for sure — at least in theory. These tests can be tricky to perform in multiples, and you may not be able to get a sample of each baby’s DNA. If you can’t or don’t want to have these tests, an ultrasound can often tell you whether your babies are dizygotic or monozygotic,
