Does anybody else think that Doc's stethoscope could actually be the Amulet of Avalor in a different form? This is a thought that crossed my mind just yesterday after watching a few episodes of Sofia the First, and noticed that the stethoscope worked exactly like the Amulet does. So clearly Doc has done a good deed to be able to talk to toys.
The stethoscope and Amulet of Avalor have different powers, but I do think that the McStuffins family had amulets before they had stethoscopes, seeing how Doc wears and uses hers. They likely were toy sorcerers similar to Drosselmeyer before later generations integrated into "normal" society.