If too much attention is focus on the problem, if a parent becomes obsessed with the child's eating habits, or if the child feel pressured, a small problem might balloon into a large one.
Is he gaining weight
or being stable?
Does he have energy?
Is he healthy?
If he lost weight
, doesn't eat at all, does'nt have much energy and look sick for a while, go see a doctor.
Hope I could help and reasure you.
A today's parent book, The Picky Eater, Sharon E.