Source: Child Welfare Information Gateway
From the factsheet:
Despite the efforts of the child protection system, child maltreatment fatalities remain a serious problem. Although the untimely deaths of children due to illness and accidents have been closely monitored, deaths that result from physical assault or severe neglect can be more difficult to track because the perpetrators, usually parents, are less likely to be forthcoming about the circumstances. Intervention strategies targeted at solving this problem face complex challenges.