I wish people could see the surrender forms that we get almost daily. I just got one yesterday from a young lady who received a yorkie puppy as a HS graduation gift. This was ten years ago and now she is married and has a one year old child. She wants to surrender her yorkie. She cried on the phone, but clearly has made a choice that her family comes first. She is one of many. Then, there are the yorkies who are dropped by children and end up severely injured....many of them end up in rescues.
I commend the OP for looking for information. Yorkies are terriers and even though they do sometimes work out well with children, they are not known for being good with them.
I am not saying that it never works because it does; but, I will say that a very large percentage do not work.
Not many people are going to openly admit that their yorkie is stressed out by their children....or that they gave them up because the yorkie was nipping at the children (a very common occurence), the child was allergic (no, I don't think so either, but it is a common excuse), or the yorkie was dropped and was injured.
And...welcome to YT!
Yorkies are a great breed...you will find lots of information about them on this site!