Hi J.---From what I read, you shouldn't worry too much about your son's eating habits. I have my own business as a Wellness Educator and I frequently use Dr. William Sears as a resource. The following is from his website, www.askdrsears.com.
"Why toddlers are picky. Being a picky eater is part of what it means to be a toddler. We have since learned that there are developmental reasons why kids between one and three years of age peck and poke at their food. After a year of rapid growth (the average one-year-old has tripled her birth weight), toddlers gain weight more slowly. So, of course, they need less food. The fact that these little ones are always on the go also affects their eating patterns. They don't sit still for anything, even food. Snacking their way through the day is more compatible with these busy explorers' lifestyle than sitting down to a full-fledged feast.
Learning this helped us relax. We now realize that our job is simply to buy the right food, prepare it nutritiously (steamed rather than boiled, baked rather than fried), and serve it creatively. We leave the rest up to the kids. How much they eat, when they eat, and if they eat is mostly their responsibility; we've learned to take neither the credit nor the blame.
Toddlers like to binge on one food at a time. They may eat only fruits one day, and vegetables the next. Since erratic eating habits are as normal as toddler mood swings, expect your child to eat well one day and eat practically nothing the next. Toddlers from one to three years need between 1,000 and 1,300 calories a day, yet they may not eat this amount every day. Aim for a nutritionally-balanced week, not a balanced day."
You might like to go to his website and read the rest of the article. Please feel free to contact me for other ideas. There is no charge for the 'education' that I offer. I do use a wonderful whole food supplement called Juice Plus+ as a part of my business. JP+ is 17 different fruits, veggies and grains in capsule, chewable or GUMMIE form. It is my family's nutrition insurance. The gummies can be cut into very small pieces and at least you know he will be getting a wide variety of nutrients despite what he eats from the dinner plate.
Feel free to contact me with any questions and for other tips to optimize your family's nutrition and health. Be well, D. ###-###-#### www.dianeshealthed.com