What do people do about light eaters?

Food is a constant struggle in our house, and we get our older one (3yrs) to eat about 700 calories a day through a combination of vigilance, threats, distractions, and bento-tricks. He remains at the 3rd percentile for weight/height, and is short for age (he stopped growing completely for a while)

The only advice we received from Drs was to add oil or butter to his portions. He's starting to be more like a classic picky eater, but for the most part, he eats anything, just only one bite at a time.



DS1: Hon, you already finished your homework
DS2: Quit it with the protesting already!