The fetus now weighs approximately 9 ounces (255g) and measures about 6.5 inches (16 cm) long. Your baby's entire body may be covered by lanugo (soft hair) and a pasty white substance called vernix protecting the skin. Both lanugo and vernix may be present in varying degrees at birth, with premature babies tending to have more. Other new developments this week include the appearance of tiny toenails, the first signs of scalp hair, and less transparent skin.
During pregnancy, one of the first blood tests you take checks for the Rh factor. Determined by genes passed on from your parents, the Rh factor is a type of protein that may appear on red blood cells. If you carry it, you're considered Rh-positive; but if you don't, you're Rh-negative.
People are more likely to be Rh positive (85%) than Rh negative (15%). The problem is if the mother is Rh negative and the father is Rh positive. In that case, the following could occur:
What if you're Rh-negative and your mate is Rh-positive? What if you were Rh-positive in a previous pregnancy? What if your mother lost a baby with Rh disease? To get answers to these questions, read the Rh incompatibility article.
There's nothing quite like a celebration to make something memorable. Now that you're halfway through your pregnancy, do something special tonight with your beloved to mark the momentous occasion. Set up a dreamy candlelight dinner, or get dressed up and hit the town. Stamp it forever with photographs.
Review Date: 12/9/2012
Reviewed By: Irina Burd, MD, PhD, Maternal Fetal Medicine, Johns Hopkins University, Baltimore, MD. Review provided by VeriMed Healthcare Network.