A Waterloo man has been charged with child endangerment after his four-month-old son was found with head injuries. Emergency workers were called to the apartment of Skyler Tate on a report the child was unresponsive. The child was taken to Iowa City where it was determined he suffered brain swelling. Waterloo police have now charged 21-year-old James Tate with child endangerment. Skyler Tate remains hospitalized in Iowa City.