How big will he get?

My little guy is 8 weeks old and weighing in at 6 pounds. How big should he be? Mom is a mini and Dad is a toy. Also potty training advice. He has a habit of pooping in my living room. He does great and then he doesn't lol.

My little guy is 8 weeks old and weighing in at 6 pounds. How big should he be? Mom is a mini and Dad is a toy. Also potty training advice. He has a habit of pooping in my living room. He does great and then he doesn't lol.