Out of all of the movies that producer and director Ivan Reitman made with Arnold Schwarzenegger, he cited this movie as not his best, but his favorite.
Arnold Schwarzenegger spent time in obstetricians' waiting rooms to learn how pregnant women behave.
Following Twins (1988) and Kindergarten Cop (1990), this is the third movie in an unconnected trilogy of comedies directed by Ivan Reitman and starring Arnold Schwarzenegger. Schwarzenegger's co-stars in this movie include Danny DeVito (who also starred in Twins (1988)) and Pamela Reed (who also starred in Kindergarten Cop (1990)). All three movies involved a theme of childrearing.
Arnold Schwarzenegger wore a pregnancy suit before filming his scenes to get more in touch with his character.
An early cut of this movie ended with an abortion scene that was nixed by the studio after the subject was deemed to be "too politically sensitive". Extensive re-shoots were required to make the final movie work.