Heckerling's central hokum is definitely silly, based on the notion that Mikey (and all babies, in fact) has somewhat adult, slightly cynical thoughts on everything that goes on around him, from conception to end credits -- and that these thoughts and embryonic wisecracks and creative interpretations are heard only by the audience via the aptly cast voice of overgrown kid Willis.
Los Angeles Times
The movie but, rather surprisingly, given the gimmicky premise, it's not gag-me-with-a-pacifier cute nearly as often as it is genuinely charming. [13 Oct 1989, p.12]
Peter StackSan Francisco Chronicle
Look Who's Talking plays baby-picture cute almost beyond the limits of the tolerable, but it has enough spark and intelligence to be a very likable, occasionally riotous romantic comedy. [13 Oct 1989, p.E1]
Hal HinsonWashington Post
A lot of this stuff is irresistible. In the early going especially, the movie's infantilism is snappy and surprising. But this is a great idea for a sketch, not a feature, and if Heckerling had resisted padding it out, it might have made a brilliant short. A comedy can ride only so far on high concept. It has to deliver the jokes, and this one doesn't.
Jay CarrBoston Globe
Before long, it runs out of steam, playing like the pilot for a TV sitcom called "Baby Knows Best." [13 Oct 1989, p.37]
Allison BenediktChicago Tribune
Though the film has a plot a simpleton could follow, its hallmark is confusion. Its sense of time and place and its point of view are muddled. [13 Oct 1989, p.L]
Vincent CanbyThe New York Times
Cute is the operative word for the movie, which stars some good actors doing material that is not super.
Peter TraversRolling Stone
This flabby comedy deserves only one thing: to fall on its fat one.
Like a standup comic pouring 'flopsweat', this ill-conceived comedy about an infant whose thoughts are given voice by actor Bruce Willis palpitates with desperation.