The average weight for a boy of 6 years is 21kg and height 121cm. So you can see that your son's weight and height are both below average. It is his weight that worries me as his weight is on the very lowest level of the growth chart for boys of 6 years. He may also be anaemic as he tires easily.Another possibility based on the story you have given here is that he may be have a problem with his blood sugar. He should be seen by your paediatrician.
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