You are concerned about your son's very unusual eating habits.His eating pattern is not that of a 9 year old boy who should be eating well and with a hearty appetite. Although he seems to be happy when he is with you, how is he reacting to the fact that you and his mother are separated. He has the build of a 5 year old boy according to you. How do other boys his age treat him? Is he just pretending to be happy or is he being teased at school in spite of having a few friends? His odd complaints about headaches when eating or leg pains suggest a possible psychological cause. It would be best to ask a clinical psychologist to see your son. Even if the psychologist finds that all is well then at least we know that a possible psychological cause has been excluded.
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