I think you need DLC for milking content. I experimented it with steam version there is no way to get mother's milk from pregnant ladies and giving birth just results in already grown up native.Eh, i don't really care if they will gave birth or not, i just need to milk them lmao. I've tried to impregnate untamed native before even with the item but there's no native is impregnated by man message or something like that unlike when i impregnate tamed native, it's weird that there's no message like that considering there is no other way to check wether they're pregnant or not since we can't see their status