QR Code Link to This Post Adorable baby mini rex boy. He is a sweet 12 week old that is tiny now and will only get to about 3 pounds full grown. Mini rex are wonderful pets for children since they love people and stay small so are easily handled. They are also easily housetrained. It would be great to have this guy go to a home with children as that's how he has been raised. Re-homing fee of $25. Please email if.