My Laurel also had no problema whatsoever with potty training and did very well in her puppy and obedience classes. Chis are smart! They do well in Agility, Rally, and any dog sport that is willing to accomodate their small size.
Congratulations on your Christmas Bella and I think we both made the right decision in walking through this chapter of our lives with our very little dogs.
Laurel: born 9/1/18, 7 lbs, my homegrown
Chocolate: born 10/4/18, 9.5 lbs, rescued from DV situation