Junior (1994)

Genre:Comedy | Romance | Sci-Fi
Tagline:Nothing is inconceivable
Starring: Arnold Schwarzenegger, Danny DeVito, Emma Thompson

Plot:As part of a fertility research project, a male scientist agrees to carry a pregnancy in his own body.

http://www.imdb.com/title/tt0110216/
http://en.wikipedia.org/wiki/Junior_(film)