The Switch (2010/I)

Kassie is a smart, fun-loving single woman who, despite her neurotic best friend Wallys objections, decides its time to have a baby even if it means doing it herselfwith a little help from a charming sperm donor. But, unbeknownst to her, Kassies plans go awry because of a last-minute switch that isnt discovered until seven years later when Wally gets acquainted with Kassies cute though slightly neurotic son.