How to have 2 cubs after the first cub you had?

As of 2022, for the second cub in your family both you and your mate have to be level 20. If both of you are already 20 or higher, sleep in your den in singleplayer mode. You are/your mate is pregnant now. Hunt for animals/bosses, get 10000 EXP, sleep in your den again and the cub is born. For the third cub you have to do the same as for the second, but you and your mate will have to be level 40 this time. (For the fourth cub it's level 80, for the fifth level 120, for the sixth it's level 160)