Welcome to YT. Puppies are a challenge after having older ones. Congratulations on your new puppies. Please feel free to share their names and pics when you get a chance. Food selection is a personal choice really, because there are many good quality foods and it also depends on each yorkie's taste buds, too. SD is not considered a good quality food. Please check out the following section and you will find lots of information there on good quality foods:
Yorkie Health & Diet - YorkieTalk.com Forums - Yorkshire Terrier Community