It is possible that your son knocked his head so badly that he was actually concussed although this is very rare in young children. Concussion can lead to memory loss like this. I am concerned about your son who has had two very hard knocks to his head lately. Sometimes serious complications such as a small intracranial bleed can occur and the symptoms and signs may be very difficult to detect. I would suggest that your son be examined by a paediatrician. If necessary a CT scan may need to be done.
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