My 16 (almost 17) month old has steadily dropped in percentiles on the growth chart over the course of his new life..he suffered from reflux and an inability to stool in his first year of life. These issues did resolve by about his first birthday, however his growth is still poor. His stature is perfect (50%), however, after being born slightly over 10lbs. he has fallen to just under the 3% on the growth chart at a mere 20lbs 2ozs. I have begun adding as many calories as I can to his milk (cream, Boost, or Pediasure) and every bite he takes. He's not a tremendous eater but he does seem to take a fair amount of liquid and he loves peanut butter and cheese which I give him all the time. In addition he eats some meats, yogurt, breads, eggs, pasta, fruit, (not big on veggies). It seems when he gets more fat calories that his stool is more like clay and really foul. Any thoughts?