Baby guineas (keets) can be raised with no parents, just like chicks and ducklings. They walk around, eat food, drink water, and go someplace warm when they are cold. The warm place can be under their mother, or it can be a heat lamp or heat plate provided by a person. Once they have all their feathers, they will not need a source of heat.
It should be fine to give the babies (keets) away at any age, if you make sure the person getting them knows what kind of care they need at that age.
