What happen when a newborns have a fever of 40 degrees Celsius?

Im just curious because its medical emergency but I have no idea how dangerous it is.especially for the newborn who were just born and have fever the

Im just curious because its medical emergency but I have no idea how dangerous it is.
especially for the newborn who were just born and have fever the next day.

or:Im just curious because its medical emergency but I have no idea how dangerous it is.especially for the newborn who were just born and have fever the next day.

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