First stages of monkeys are called Gestation. The monkey does not start as an egg like humans do, it beings in the mother’s womb where the monkey begins to grow inside its mother’s belly just like we do this last about 4-8 months shorter than the human’s gestation period.
The next stage is babyhood. This is where the monkey spends the most time on its mothers back, it lasts up to 18 months. This is when the monkey uses the time to learn and observe. Like making calls, finding food, and they even learn how to laugh!