Over at the Corner Mona Charen quotes this from Sarah Palin's profile in Wikipedia:
On September 11, 2007, the Palins' son Track joined the Army. Eighteen years old at the time, he is the eldest of Palin's five children. Track now serves in an infantry brigade and will be deployed to Iraq in September. She also has three daughters: Bristol, 17, Willow, 13, and Piper, 7. On April 18, 2008, Palin gave birth to her second son, Trig Paxson Van Palin, who has Down syndrome. She returned to the office three days after giving birth. Palin refused to let the results of prenatal genetic testing change her decision to have the baby. "I'm looking at him right now, and I see perfection," Palin said. "Yeah, he has an extra chromosome. I keep thinking, in our world, what is normal and what is perfect?"