How do you make a wolf cub on animal 3D simulator ?

So if it level 5 or above you can go to singleplayer then you fight with the opposite gender and lower its health to 30 percent and it becomes ur mate and once you have both level 10 you can go in your den and press sleep and your wife is suddenly pregnant then you have to get some xp n it will give u a message shes ready to give birth so in your den you just sleep after n the baby pops out