Guilliguine eggs will grow over time with the Guillo inside, within the egg they will learn to speak and will be provided extra nutrients through spreading honey onto the egg, which it will absorb.

Guillos will spend grow to be at full size within the egg, over the course of a couple years or so, only needing a bit of time to learn how to walk when they emerge, unless the Guilliguine hatches early, in which case they will be small and weak and need upmost care and protection, and would grow at about the same pace a human would, Guillos who hatch early might have stunted growth that ranges from slight to severe.