To all you jokesters about body stretching, virginity, and popping out the egg, it was already proven not just in this chapter but the ones before that she doesn't actually go into labor, the eggs just appear.
Also, as to the twins, obviously the ones facing each other top left, the beast master and the girl with the braid. The scholar child looks "younger" than the girl, and the two are facing each other as parallels. Not to mention hair color.