AUSTIN, Texas (AP) _ Kristin Armstrong, the wife of Tour de France champion Lance Armstrong, gave birth early Tuesday to their first child, a son.

Luke David Armstrong, weighing 7 pounds, 9 ounces, was born 13 days ahead of his expected arrival date.

``What a joy it is to hang out with this little guy,'' Armstrong said. ``I can't wait for him to wake up so I can play with him. He's just awesome.''

Kristin Armstrong got pregnant using in vitro fertilization with sperm her husband stored in October 1996, before starting chemotherapy for advanced testicular cancer.

Mother and baby were expected to be released from the hospital on Wednesday.