The average weight for a boy of 7 years is 24 kg, so you can see that your son is seriously underweight.It is possible that your son has asthma and may have other allergies as well.It is also important to exclude other illnesses such as TB. He should be seen by a doctor so that a clear diagnsis can be made of his illness. He will then be placed on the correct treatment which will really help him a great deal.
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