Amanda, welcome to YorkieTalk. You have come to the right place to get info, advice and suggestions about Yorkies AND make lots of yorkie friends. If you can think of it probably someone here at YT has experienced it.
I definitely agree with BJH and Britster. Raising a Yorkie with a young human child can be done, but like was mentioned, it IS a lot of work and will take a lot of vigilance on your part. There should be adult supervision anytime the furkid and skinkid interact.
I do agree that 9 weeks is a bit young to bring a pup home, especially with a small skinkid in the house. If at all possible it would be in the best interests of everyone concerned if the pup could stay until it's at least 12 weeks.
Hope all goes well and please keep us posted.