A 16 gram snake should be eating about 1.7 to 2.0 grams per meal.
You could feed 1 pinkie weighing that amount or 2 that total that amount.
A good rule of thumb for feeding snakes is to feed about 10% to 13% of the snake's weight per meal.
Thus, if your snake weighs 20 grams, you'd feed about 2.5 grams. If your snake weighed 100 grams, you'd feed about 12 grams, and if your snake weighed 300 grams, you'd feed about 30 grams.... etc......
By the time the snake is full grown, you'll slow down on the feedings, space them out over a 2 or 3 week period of time instead of weekly, and just continue to feed about a 30 to 35 gram mouse or rat. After the snake reaches about 300 grams, there's really no need to keep increasing the size of the prey. (This would apply to smaller snakes only, ie- Corn Snakes, Milk Snakes, King Snakes, etc) of course larger snakes Boas and Pythons will require larger and larger meals, but you don't want your corn snake to get fat.