ANCHORAGE, Alaska The daughter of former vice presidential candidate Sarah Palin has given birth to a son, a magazine reported Monday.

Bristol Palin, 18, gave birth to Tripp Easton Mitchell Johnston on Saturday, People magazine reported online. He weighed 7 pounds, 4 ounces. Colleen Jones, the sister of Bristol's grandmother, told the magazine that "the baby is fine and Bristol is doing well."

The governor's office said it would not release information because it considers the baby's birth a private, family matter. Palin family members, hospital employees and spokespeople for the governor's former running mate, John McCain, either would not confirm the birth or did not return messages from The Associated Press.

The father is Levi Johnston, a former hockey player at Alaska's Wasilla High School.

Palin announced on Sept. 1, the first day of the Republican National Convention, that her unwed daughter was pregnant. The campaign issued a statement saying Bristol "and the young man" would get married.

Levi Johnston's mother eventually disclosed that her 18-year-old son was the father. The following week, the young man attended the convention in St. Paul, Minn., when Palin accepted the vice presidential nomination.

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