The little girl, whose name is inspired by the poet W. H. Auden, weighed in at 7 lbs. 7 oz. She joins brother Owen Strausser Wyle, who turns 3 on Nov. 9.
Wyle, 34, who played Dr. John Carter on ER for 11 years, and his wife, 37, a former makeup artist, met in 1996 on the Bethel, Maine, set of his movie The Myth of Fingerprints. They wed in California's Santa Ynez Valley in May 2000.
One of few cast members who had remained on ER since its 1994 debut, Wyle said goodbye to the show at the end of last season.