Regarding your first question:It is very difficult to be sure about your son's illness without being able to see him.It is likely that he has picked up a severe viral infection particularly an infection due to an adenovirus infection.This is not responsive to an antibiotic. The question really is why is your son getting these bad infections so often? At his age he hardly has any of his sinuses formed yet, so I am not happy with assuming that he has a sino-bronchitis problem. Is he at a creche where he is picking up one infection after another? Another possibility is that he may have an immune deficiency such as a low IgA or IgG or IgG subclass deficiency.There are also other possible causes that need to be excluded such as cystic fibrosis and a condition called the immotile cilia syndrome. Your son needs to be properly investigated and these tests and also blood tests should be done.I suggest going back to the pulmonologist. Please ask about all of these tests.At the same time his iron test should also be repeated.
Your second question:It is unlikely that an Rh incompatability problem is the cause of your son's iron deficiency. There is no doubt however that your younger son also is iron deficient.He has a problem known as pica due to this deficiency. He should have the necessary tests done first and then must go onto iron treatment.
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