Usually a cat mother will teach her kittens how to use a litter box or tray. I know my mother taught me when I was very young. Not that I remember it. I didn’t always use a litter box until after I went to live with my girl. She actually showed me the box of litter and even picked me up and set me down in it. I knew what it was for and used it when I needed to.
Spot was a different story. My girl brought him home and he was much too young. My girl had to bottle feed him. I taught him how to be a cat. He picked up strange habits from her. I was the one who taught him how to use the litter box. My girl was no help with that.
The little guy looked up to me from the start. He was glad to be around an adult cat. I couldn’t stand him at first, but I can be a great example of a well behaved cat. So, I did my best and he learned how to use the litter box instead of going on the floor. It didn’t seem to matter that he had to climb into the box when he was so small. He just did it and buried his waste as he was supposed to. I couldn’t complain about that. Neither could my girl.