We always said that they were thriving when the puppies hiccough.
Actually, it tends to be a young puppy thing. Because when with littermates there is always a certain amount of competition for the food it tends to be an “Eat it up quick before the others get it!” thing. As they get older in their new home, and without the competition of littermates, so they gradually slow down just a little (Even if it does not appear that way!!!!!!!!!!!!!!!) and the bolting of food, and the hiccough which goes hand in hand with it gradually subsides.