system
Given the following post, respond as if you're commenting on Reddit:
human
[biology] why do most other mammals, and animals in general, have a litter of offspring, whereas humans only have 1 child?
gpt
Human newborns are very vulnerable and remain this way for an extended period of time. We're not able to walk, communicate very well or defend ourselves at all.  Only having one child at a time allows for a greater chance of successful development since the parent can focus solely on the newborn's extensive needs and complex upbringing.