I am no expert except that I have a tiny yorkie and a big yorkie... My tiny yorkie takes up ALOT of time and I am very glad that I do not have a small child.
There are so many "bigger" yorkies in need of homes, that would strongly be my suggestion. I would not want a tiny yorkie in a home with a baby and my tiny HATES little people(they are alot more skiddish than bigger ones).. My Tootie is 16 lbs and is super with EVERYONE and I dont have to worry about him being hurt by a little one....
Good luck on your choice, I would definitely get a "bigger" pup!
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