Oh, one other thing reader. There is only one gender in this world. The ones you refer to as males. Although these men, are much more powerful than the ones you know. A fully-grown adult stands at 20 feet and have the strength and muscles of the being you refer to as the Hulk. They also don't bother with clothes.
Needless to say, they way they reproduce is different. Unlike the inhabitants of your world, they need a special blessing from a priest. This process requires the one will carry the baby to be fucked by their partner in their ass and their priest fucks their mouth while saying an incantation the whole time. The way they know that they are pregnant is when the carriers cums turn blue. After that, it only takes 6 months for the boy to be born. During that time the carrier's pecs will get bigger as it is producing milk for the boy which will be its only food source for the first year. Like the carriers of your world, their stomach will get bigger, although they will cum all the time while pregnant, even when they don't feel horny, however when they cum blue again, the carrier will be as you say is in labor. Until the baby is born, they will be cumming quite a bit. The more they cum, the closer the baby is to being born. It also comes out of the bearer's butt.
Now as far as the children themselves, when they are born, they have the physique of a two-year old in your world and will normally only wear clothes until they enter puberty, which in this world starts at around ages 9 and 10. The first erection is what mark the beginning of puberty and will last for about 4 years. While they going through the process, they are only allowed to have oral sex and are only allowed to have anal sex after puberty is finished.