"It's a Boy" stars Horton as Dudley Leake, who is betrothed to Mary Bogle (the very pretty Wendy Barrie). Shortly before the wedding, Dudley blurts a confession to his friend and best man, Jim Skippett: 20 years ago, Dudley had a brief affair with a certain Miss Piper, but he's never heard from her since then. Next day, who should suddenly appear? A youth about 19 or 20 years old, claiming to be named Joe Piper. Is he Horton's son, or is Skippett playing a practical joke?
Leslie Henson
Albert Burdon
Edward Everett Horton
Heather Thatcher
Alfred Drayton
Robertson Hare
Wendy Barrie
Helen Haye
Joyce Kirby
J.H. Roberts
Clifford Buckton
Finlay Currie
Gladys Hamer
Grethe Hansen
Roddy Hughes