The aww-fest begins right away in Focus Films' new documentary "Babies." The film, in theaters Friday just in time for Mother's Day, follows four babies across the globe in their first year of life.

With all the squirming and gurgling, the crowd was positively infantile at a swanky movie house one recent afternoon in Madison, Wis. So was the action onscreen. About 100 moms and a sprinkling of ...