H.D.
This I can totally relate to and guess what DONT WORRY.. Really. i'm not joking,.. my 2 yr old has taken complete control over her eating habits which is very typical for kids in when they're younger,.. I was worried to but her speach teacher told us that during the course of a week the kids get enough nutrients to make up for those not so great eating days.. there's days where she'll just eat a couple spoonfulls of peanutbutter and some oatmeal etc.. Kids are only suppose to eat about a tablespoon of each food for each yr they are.. ex. 2 yrs old = 2 tablespoons of each food... My husband still worries but if you watch your son threw the week you'll notice he gets plenty of the foods he needs...
Hope that helps..