well Rose kept many secrets...such as possibly using machinery she knew about but didn't tell the others regarding fusion experiments.



Heck the shapeshifted a womb thing is so suspect, its not just like an egg in there, there are blood vessels, that connect to the mother's blood vessels, bringing nutrients to the baby from things she eats being digested...she'd have to have shifted a functioning human body really.



So eyebrow raising all around, making the Steven isn't as human as he seems theory make more sense as he couldn't have had a regular pregnancy...add that at some point Rose's gem had to switch from her to the baby inside of her...and she poofed away when that happened so...what was actually growing inside her and how? and if Steven was a separate entity inside her *as we saw her with a pregnant belly* then he existed without the gem at that state, so why need it after being born?



There are a few holes in this development from one stage to the next, to the next.