This is a 3 month study for pediatric patients between the ages of 6 months and 18 years that have a current diagnosis of heart failure. This study will compare the use of the medication finerenone to placebo. During the study, participants will continue to receive their standard of care therapy according to pediatric heart failure guidelines. At the end of the 3 month study period, participants will have the option to enroll in a 9 month open label extension.