You wouldn’t need to raise it as a baby.

The reason that humans come out as babies in the first place is because if we came out with fully developed brains, our heads would be crushed through the birth canal and the mother would probably die. Therefore, our brains have to mature as we get older which of course takes decades.

Growing up is a biological imperative.

In terms of artificial intelligence or large language models, there would be no need to actually grow in physical size.

Which solidifies the point a person already made here is that it would be a fundamentally different kind of intelligence one that simply needs data input And will not need the ability to grow up as a child would.