Nonman

https://en.wikipedia.org/wiki/Brood_parasitism

Nonmen are human brood parasites.

They break in and leave what looks like a human baby on the floor, and because humans have empathy, they will raise it. They also know there is a chance it is a real baby because people in The Playground sometimes do this when they are at rock bottom and cannot raise a baby.

If it is a nonman baby, it will rapidly age and after about a week, leave.