Cynthia Edson Libby and John Libby, a boy, Michael Andrews, July 6, St. John’s Hospital, Santa Monica.Mother is senior council for 20th Century Fox; father is non-pro. Michael and Linda Beckner, a boy, Andrew Frost, July 12, Huntington Memorial Hospital, Pasadena. Father’s a screenwriter; mother is non-pro. Jeff and Danna Black, a boy, Matthew James, July 19, Englewood Hospital, N.J. Father is VP, talent and music programming, for Semaphore Entertainment Group; mother is senior director of music promotions for Unique Product Placement. Laura and Mark Joslin, a girl, Hallie Jessica, July 27, Glendale Adventist Hospital. Mother is manager of production finance for Paramount Pictures domestic television division; father is a writer.