It is normally after falling past 2 major percentile lines which your son has passed. He is still proportionate but if his curve has been slower than that of the chart that can explain the difference. Do you have any other random weights to see if you can plot his growth curve and see if he has a curve or if he was fine at first then gradually slowed down growth wise? That would be helpful for you to know. Birth weight has more to do with the mom usually than the baby.
I have seen you on either the food allergy or asthma board..or both. Danny has both as well. It makes feeding him hard but finding healhty fat foods that he likes has been extremely helpful. He eats a lot of meat and used to eat a lot of cheese but that started causing problems in the bm department so we have stopped cheese for a while. Yogurt, milk, avocados and garbonzo beans turned into hummus are good as well. Danny won't eat the avocado but if you can get your little man to eat them they are a really good source of good fats.
We have started peptamen Jr because even with the high calorie diet he is on now and the enzyme replacement he isn't gaining weight. You can also make out a food diary. Write down serving sizes and brands, types, and condiments with the food. If you are in the area of a children's hospital there is usually a nutrition department that your ped can refer you to and they will calculate how many calories he is getting. You do the diary for three days and they take an average. If he isn't eating enough calories to grow than he won't. You can't force feed him but at least you will know that once he eats more you will be able to get him to gain weight.
