According to our understanding, the fact is that the explanation for SIDS is unknown. That's the reason it was being moved to an already existing category, which is called “unknown”. When they go through the investigation, they're trying to rule out different causes. SIDS is one, essentially, where there's no other explanation. Under those circumstances, because it was considered unknown in the context of the timelines of children's ages and so on, and the circumstances, it was felt that it should be moved to the general category of “unknown”.
