Children - As enacted, adds the commissioner of mental health and substance abuse services, and one at large member with experience advocating for children, to the Tennessee second look commission; revises certain severe and aggravated child abuse offenses to include offenses involving strangulation; authorizes a court to order a child's custodian to submit certain documentation of compliance with preventative pediatric care consistent with the periodicity schedule of the American Academy of Pediatrics in certain situations; authorizes the department of children's services to initiate a visit to ascertain the wellbeing of a child if such documentation contains allegations of abuse or neglect. - Amends TCA Title 37; Title 38; Title 39 and Title 40.