Welcome to YT!
Yeast infections in the ears are common, but definitely not "normal". Yeast is an opportunistic infection- you get an over growth of it when the immune system is out of whack due to poor nutrition, hormone imbalances, food allergies and a whole host of other things. Stress, such as going from her littermates to a new home can also cause a flare up.
Scrupulous ear hygiene and medication from the vet can help stem a mild infection. Yeast likes warm, damp places to multiply.
Weight: there are multiple charts on the net that will try and guestimate the adult weight of a yorkie, but they are just that- guesses. It really requires knowing the weights of at least 3 generations of lineage to give you a good idea, and even then, there will be the odd larger/smaller than usual pup. One of the formulas for the guestimates is double the weight @ 12 weeks and add another pound.
Food: I'm partial to Blue Buffalo Small Breed Puppy. Check out the diet and nutrition thread for lots of discussion on what works for others.
I'm sure someone will come along and help you with the potty training question. I'm getting ready to transition from piddle pad to grass, so I look forward to seeing what they tell you.
__________________  Don't get your knickers in a knot. Nothing is solved and it just makes you walk funny. |