726.6A  Multiple acts of child endangerment — penalty.
  A person who engages in a course of conduct including three or more acts of child endangerment as defined in section 726.6 within a period of twelve months involving the same child or a minor with a mental or physical disability, where one or more of the acts results in serious injury to the child or minor or results in a skeletal injury to a child under the age of four years, is guilty of a class “B” felony. Notwithstanding section 902.9, subsection 1, paragraph “b”, a person convicted of a violation of this section shall be confined for no more than fifty years.
94 Acts, ch 1172, §59; 96 Acts, ch 1129, §110; 2013 Acts, ch 30, §253