The youngest, Republicanest View crew member gave birth to a son, Isaiah Timothy, Sunday afternoon in a New York hospital.
Hasselbeck has two other children with her former footballer husband, Tim Hasselbeck: Grace Elisabeth, 4, and Taylor Thomas, 1.
Elisabeth, 32, surprised fans and her cohosts with news of the third pregnancy on the show Jan. 29.
Little Isaiah weighed 7 pounds, 7 ounces. Tim reports that both Elisabeth and the baby "are doing great."