The Switch (2010)

Movie Title: The Switch

Country: USA

Year: 2010

Kassie is a smart, fun-loving single woman who, despite her slightly neurotic best friend Wally's objections, decides it's time to have a baby--even if it means doing it by herself... with a little help from a charming sperm donor. But, unbeknownst to her, Kassie's plans go awry because of a last-minute switch that isn't discovered until seven years later when Wally finally gets acquainted with Kassie's precocious -- though slightly neurotic -- son.