ITA - child abuse includes the failure of a parent or caregiver to adequately ensure the safety of a child which results in physical injury and significant harm to the child. I can see this happened in William's case. Regardless of whether he was killed by an accidental fall or kidnapped by an unknown offender, the fact is that he was left outside unsupervised for a period of some time. A 3 year old child requires constant supervision - just like at 3 year old kindy, there is always a teacher or a teacher's aid watching the children. The Foster carers failed in their duty to keep him safe IMO.