The Day-Care Threat is a Star Tribune series examining the sharp rise in child-care deaths in Minnesota during the past five years. Reporters reviewed hundreds of death certificates, licensing documents and court records that reveal patterns of life-threatening safety violations.

May 6: Most deaths involved children who were sleeping, often in conditions that violated safe-sleep guidelines.

May 20: At overcrowded day cares, the risks mount.

May 30: Important safety records are often inaccessible to parents.

July 15: Home-based child care has looser regulations than center-based care, resulting in increased risks to children.

Today: How Kansas made child care safer.