As adults we have to take control of the food we give our children, the quality and the quantity. Too much of a good thing can be damaging, not only by overloading with fibre or sugar (even natural sugar), for example, but by forming bad habits.
The Infant and Toddler Forum has a wonderfully clear guide on their website here
I know children are generally admonished for not eating but often children are praised for finishing a Daddy sized meal.
Being big and strong is a world away from laying down the foundation for being big and unhealthy.