I'm no expert, but we used Beef flavored BABY FOOD.....with a syringe. The breeder did recommend putting just a little Karo syrup in there to prevent hypoglycemia (plus they seem to like the taste). One baby was six weeks when we got her, our second eight weeks (they should be starting in on dry food around that 8 week age). How old is your puppy ? I wouldn't fret too much, but they do need to eat, our breeder recommended three times a day to make sure they get the proper nutrition. Anyone please feel free to correct me if I'm wrong !!!!!!!