Mollie (Kirstie Alley) is pregnant by Albert (George Segal), a married man who won't leave his wife. When her contractions start, she leaps into a taxi, driven by James (John Travolta) who accompanies her not only to the hospital but into the delivery room. Mollie gives birth to a healthy boy, Mikey (voiced by Bruce Willis), and soon James is baby-sitting for her while she goes in search of a suitable father.