My first yorkie many years ago was my first baby and when my kids came 1 by 1 starting when he was a year old, it was like they all grew up together. I have 3 kids 20, 17, 14, and I think having my yorkie before the kids worked out perfectly. My kids were never rough with him and visa versa. It was a growth experience for my kids and the yorkie, kids learned respect for animals from birth, and my Sinbad learned to be around them with no problem. Now i have Paris and my boys are home and they know to be gentle with her. Though she can be rough and tough, so she thinks.
