It is difficult to give you a definite answer without knowing if this was just a very small bleed from your little son's nose or he seemed tp bleed a lot.A single small bleed can occur with severe colds and infections of the nose.There are a number of causes of more svere bleeding. Your son is very young to have had a nose bleed and the safest approach would be to take him to be seen by a doctor. The doctor should arrange for a full blood count test when he is seen.
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