'Partial-Birth Abortion:' Separating Fact from Spin : NPR
"Take, for example, cases in which the fetus develops hydrocephalus (commonly known as water on the brain). Often undetectable until well into the second three months of pregnancy, the condition causes enlargement of the skull up to two-and-a-half times its normal size. It not only results in severe brain damage to the fetus, it can also create severe health risks to the mother if she tries to deliver it vaginally... Some doctors say D&X abortion is a preferable method for ending such pregnancies without damaging the woman's cervix...
Sometimes. Labor can be induced, or the fetus can be removed by caesarian section in some cases."

The world is not black and white. It is easier to see it that way, but it just isn't.