She talks candidly about what it was like to carry Trig, a Down syndrome baby.
"How she wasn't certain that she was going to have this child, that she could handle it. so you see her, with her husband. We interview her husband, and I don't believe he's been interviewed before, you meet the baby, and you see how she copes," said Walters.
Barbara also interviews Palin's daughters Willow and Piper. You can watch it all tonight on 20/20 at 10 p.m. on ABC7.