My son (4.5 years) complains of stomach ache all the time. He is suffering from stomach ache since 2 years. We had got scanning done a year back and our family doctor found nothing. But he still complains of stomach pain. He experiences this pain when he eats any thing or drink milk, sometimes even on empty stomach. He never over eats or drink too much of anything. In fact I feel he does'nt eat or drink enough for his age and he is 11.00 kgs in weight.