I can think of only one expression to sum up this movie: Euuwww.
Marlon Wayan plays a midget of a man (the actor's face has been CG-ed onto a body of a small boy) who robs jewellery stores by hiding in bags. However, when a prized jewel is accidentally dropped into the bag of a suburban woman (Kerry Washington), Marlon tries to get the stone back by disguising himself as a helpless little baby left on the doorstep of her home.
She and her husband decide to look after the baby, and all manner of supposed hilarity ensue. The baby punches the groins of other men and grabs the breasts of attractive women. Sometimes, the hideous-looking infant even speaks in his normal adult voice and flips his middle finger to others which, idiotically enough, does not make anyone suspicious.
There are a few moments of hilarity, but the most common response that it will elicit from you would be "Yuck, Yuck, and Yuck". We beg you not to see it, if only to deter the filmmakers from ever making anything like this again. Please.