Hi and welcome to YT! congrats on your new baby, duke. My yorkie is 6 months old and still has accidents.
yorkies are very hard to potty train! My little guy is getting the hang of it now! I am also crate training. You have to take them out as soon as you open the door of the crate. I also found I had to stay outside a long time(an hour) before Remy would potty! So stay out there. While and praise him and give him a treat when he goes! Good Luck!!