system
Given the following post, respond as if you're commenting on Reddit:
human
[Steven Universe] Can someone explain to me Steven's "birth"?

So, let me get this straight:

- Gems are aliens.
- Gems can take on a form, but it is an "illusion" as stated by Garnet.
- Gems can shapeshift into any form they wish, within reason of size and etc.
- Gems and humans cannot fuse.
- A gem can only be connected to one form/consciousness at a time.
- As seen in the video Rose left for Steven, Rose was pregnant.
- Rose is gone, Steven is here now.
- Steven is definitely the son of his father because of his similar appearance and mannerisms, and by testimony of everyone else.

What I'm wondering is, how was Steven created, or made, or whatever? Did Greg seriously knock up Rose? But their forms are just illusions, so that shouldn't be possible, right? Especially since they don't process food or sleep or any other human functions? So, why would Rose process childbirth?
gpt
>Especially since they don't process food or sleep or any other human functions?

False. We've seen these forms drool and cry so they *can* replicate bodily functions. Not to mention shapeshifting.

It's not an illusion. Think of it as a hologram with mass. 

So yeah, Greg and Rose "fused" amd then Rose gave brith. Her gem is not only on her "stomach" but on her "womb" amd thus when Rose "gave birth" she had to sacrifice her gem.