One of the primary differences between Peloran and Terran humanity is the Peloran growth cycle. The Albion originally created the Peloran as test tube babies grown in artificial wombs. The first batches were all male, since they were supposed to be soldiers. They grew from implanted embryos to delivery in a month, as quickly as a rabbit. They manifested their superior intelligence immediately and could talk and walk within another month. They rapidly aged through childhood, and their healing factor began to manifest until they reached puberty at two years of age. That was when their superior strength and speed began to manifest. The plan was for the Peloran to be combat ready troops within two or three years of initial implantation. Puberty was where all their plans went sideways.

An excerpt from A Primer on the Races of Humanity