It's Alive in order

It's Alive is a 1974 American horror film written, produced, and directed by Larry Cohen. In the film, a couple's infant child turns out to be a vicious mutant monster that kills when frightened. Notable talents involved in the movie were Bernard Herrmann who composed the score (noted for his work on many films of Alfred Hitchcock) and Rick Baker for makeup and puppet effects. The film was followed by two sequels, It Lives Again (1978) and It's Alive III: Island of the Alive (1987) and a remake, It's Alive (2008). 3 films, 4h 36m in all, in release order.

1. 1
   

   It's Alive

   1974 · 91 min

   The Davises are expecting a baby, which turns out to be a monster with a nasty habit of killing people whenever scared. And it's easily scared.

   Popcorn Flick
2. 2
   

   It Lives Again

   1978 · 91 min

   Maternity wards echo with the patter of tiny claws as more murderous baby-faced monsters are born. But rather than kill their monstrous offspring during delivery, cursed parents flee to secret incubation hideouts.

   Snoozefest
3. 3
   

   It's Alive III: Island of the Alive

   1987 · 94 min

   The mutant babies have been placed by court order on a deserted island. Appalled by the cynicism and exploitation by the legal system and the media, the man responsible leads an expedition to the island to free them.

   Snoozefest