<Li> Jaryd Waterhouse as Mikey (age 6 months) </Li> <Li> Jason Schaller as Mikey (fetus - newborn) </Li> <Ul> <Li> Bruce Willis as the voice of Mikey </Li> <Li> Joan Rivers as the voice of Julie (uncredited) </Li> </Ul> <Li> Bruce Willis as the voice of Mikey </Li>

Mikey's voice from look who's talking