The democracy gets to argue about that. But as I said above, there are close cases, and this is an easy case. This is going to be over any rational line. If the child needs medical attention, that is rightly called a crime. You can't inflict physical injury on helpless dependents, be they children, disabled people, or elderly people.
Doesn't anyone else think that it's relevant that Adrian lost a child to a "disciplinary" beating? Wouldn't a loving parent re-analyze the role of physical discipline for the dead child's brother?