After a three-year-long ebb, the number of children in Connecticut without health insurance is once again rising. According to a new report from the Georgetown University Center for Children and Families, about 24,000 children in the state lacked health coverage in 2017, amounting to about 3.1 percent of all people under the age of 18. This marks a reversal of a decline that began after 2013, when the number of uninsured youth was nearing 5 percent, and reached a new low in 2016 at 2.8 percent, the study shows. Researcher Tricia Brooks, the study’s author, said the increase may be the result of a 2015 rollback in income eligibility for Husky Health, the state health care plan that encompasses Medicaid and the Children’s Health Insurance Program.