This is not very common but can occur in families where there is a tendency for one or other of the parents to have developed grey hair early in life. So it can simply be a familial pattern. However there is at least one genetic condition called Waardenburg's syndrome which needs to be excluded so it would be best to ask your paediatrician to see if there is any indication that this condition may be present. It seems unlikely but it would be best to be sure.
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