Welcome to YT.
I am glad you have a healthy litte guy.
I just wanted you to be aware that the term "teacup " is really a way for sellers to charge a lot more money for puppies. This term is actually not flattering to the Yorkie breed, and typically it is a "red flag" to buyers.
I do not know any schnauzer/yorkie mixes right now. Do you have any pictures of them?
That seems like a interesting combination.