Hi there and welcome to YT. in my opinion, I would rather have a yorkie who is over a year old with young children, or wait until the kids are older.
I'd visit the Yorkie several times before m aking any decisions. I would also bring my child to see how the dog responds to my child. Your going to want a loving Yorkie who is tolerant. My Suzi Yorkie is 6 months old. She is very energetic and playful. But, likes to playbite. If I had a toddler I would be worried that Suzi could bite too hard on the baby. THat would concern me. I'd be using a pen all the time and unfortunately have the dog in there.
the baby comes first. Her/his needs have to. At least with an older dog you could get A good idea how the dog's temerment will be.
