Well you see, they are produced at factories, made with human milk, and flesh taken from dead bodies. They are put together, and smelt in a large furnace, then a brain made from many small intestines of mice that contains a memory chip inside is placed in their head. They are then tested in the Babby Testing Room to see if they can walk. Then, they are equipped with an AI that develops over time so they act like a real humanoid.
Do you want a TL;DR version of this?