The film had a complicated release through
Warner Bros. beginning in 1974. Upon completing the film, Cohen found the executives who had backed the production had been replaced and the new executives showed little interest in the project. The studio gave the film a one theater run in April—May 1974 in Chicago. It was then given a limited release beginning October 18, 1974. The film drew respectable business, but the company still did not fully support the project. Three years after its original release, Warner Bros. saw another change in executives and Cohen asked the new group to review the film. ''It's Alive'' was reissued in March 1977 with a new advertisement campaign. The updated 1977 TV advertisement features a baby carriage, accompanied by the lullaby "
Rock-a-bye Baby" and a voice-over that says, "There's only one thing wrong with the Davis baby. It's alive." The new ad drew people into theaters, ultimately earning Warner Bros. $7.1 million in U.S. domestic rentals.
Critical response On the
review aggregator website
Rotten Tomatoes, ''It's Alive'' holds an approval rating of 67% based on 24 critic reviews and has an average rating of 6/10. The site's critical consensus reads, "Tough and unpleasant, ''It's Alive'' throttles the viewer with its bizarre mutant baby theatrics." On
Metacritic, which assigns a normalized rating to reviews, the film has a weighted average score of 72 out of 100 based on six reviews, indicating "generally favorable" reviews.
Vincent Canby of
The New York Times wrote, "Mr. Cohen is not unintelligent, but the few interesting ideas in his horror films, including the recent
Demon, are drenched in supreme silliness by way of the dialogue and special effects." A review published in
Variety called it a "stomach-churning little film", praising Herrmann's "highly effective" score but criticizing the film's script as being too far-fetched. Gene Siskel of the
Chicago Tribune gave the film one out of four stars, lambasting it as "imbecilic".
Kevin Thomas of the
Los Angeles Times called it "a sort of primitive low-budget sequel — rip-off may be the better word — to ''
Rosemary's Baby. Despite patches of risible dialogue and other ludicrous bits and pieces it holds attention and even manages to be pretty scary." Tom Milne of The Monthly Film Bulletin'' wrote, "Attitudes to horror films being what they are, it's a fairly safe bet that John Ryan won't get the credit he so richly deserves for an outstanding performance which brings ''It's Alive
within striking distance of Night of the Living Dead.''"
Leonard Maltin gave ''It's Alive'' two-and-a-half out of four stars, commending Herrmann's score but noting that the film is "not for all tastes." A review published by
TV Guide awarded the film three out of five stars, reading, "Part visceral horror flick and part
Oedipal allegory, ''It's Alive'' explores a widely repressed but crucial element of family life—parents' ambivalence toward their children—and satirizes society's cavalier treatment of its youngest members." A review published by
Time Out reads, "Despite such potentially sidesplitting material, the film often manages to instill a genuinely chilling atmosphere, with its initially kitsch family growing into human beings as they plummet into a world unhinged and apart at the seams." Dennis Schwartz of ''Ozus' World Movie Reviews
gave It's Alive'' a grade of "A," praising Ryan's performance and calling the film "a wacky low-grade entertaining horror pic, one that also has an edge, is discomforting and surprisingly has a good blend of humor and splatter."
Home media Warner Home Video released ''It's Alive'' on
VHS and, on October 5, 2004, on DVD. On May 15, 2018,
Shout! Factory released a three-disc
Blu-ray box set of the ''It's Alive
trilogy. This set contains It's Alive
, as well as its sequels It Lives Again and It's Alive III: Island of the Alive''. ==Related works==