I’ve seen the assumption that “the Firstborn”, who I shall call that until another name is given, is a modified human the baby being giant and “it’s...purple”.
But, we’ve met an organic race in idw-verse before that’s naturally transformer-sized and purple, that of children Kita and Coll in Spotlight Cliffjumper:
So what if it’s the genetics of that species and not humans that was used to create the organic shell of the baby?
It would take less effort with genetic engineering for the sake of aesthetic on Scorponok’s behalf to get the baby how he wants it if to look he did just go that route.
Well, except the effort it must have taken for him to be Extra(tm) enough to modify the genes so that they have a deceptibrand facial birthmark.
The effort it must have taken to be that Extra(tm) must have been quite something.