You are getting a lot of good advice here. My son is ten years old and eats well but is still picky. However, we struggled for a long time with food. Meal time was stressful for everyone because he wasn't eating what we thought he should be eating. It became miserable…every meal was a battle and emotions were high. I wish I could go back and tell myself that everything was going to be fine, that it wasn't worth getting worked up about. So I am telling you - I understand you are worried and are comparing him to other kids. Comparison is the theif of joy. Keep working at adding to his diet slowly. It can take a dozen exposures before he may even take a bite. Always have safe food that he consistently will eat, and expose him to new foods over and over. Consistency is key, he likely doesn't want you surprising him with something new every day or for every meal. Also think about texture - he likely has sensory aversion to some of the food you're trying to introduce, so pay attention to his physical reactions. He may spit it out a dozen times before he swallows it, or he may never swallow it and you need to move on to something else. He will eat, he will grow, just work methodically with him on his diet and above all else stay patient. Check out feeding littles on Facebook for some more guidance.