I see many male yorkies with bows and they look very handsome- I don't put bows in either of my kids hair (girl or boy) because they rip them right out
Yorkies can stop growing anytime between 7-12 months- some keep growing a little more after even. I would say both of mine stopped around 10-12 months but it is pretty individual based on the dog.
I hope you will consider going to the breeding forum and read all the information on breeding- all the yorkies here on YT are gorgeous but most should not be reproducing puppies.