We have a 28-month-old son who has been small all his life, has a small appetite, and frequently skips meals.

We have a 28-month-old son who has been small all his life. He was born at 7 pound, 9 ounces and began falling off the growth chart at approximately 3 months. He breastfed for the first year with solids introduced at 4 months. He currently weighs 21 pound, 4 ounces. He has a small appetite...