Pharmacokinetics, Safety and Tolerability of Crinecerfont in Participants With Congenital Adrenal Hyperplasia Who Are Less Than 2 Years Old

Key Inclusion Criteria: * Be a female or male between 0 to \<2 years of age at screening. * Have a medically confirmed diagnosis of classic CAH (salt wasting or simple virilizing) due to 21-hydroxylase deficiency (21-OHD). * Be on a clinically stable regimen of hydrocortisone (and fludrocortisone, if applicable) treatment. Key Exclusion Criteria: * Have a known or suspected diagnosis of any of the other forms of classic CAH. * Have any condition besides CAH that requires chronic daily therapy with orally administered steroids. * Have any other clinically significant medical condition or chronic disease. Note: Other protocol-defined inclusion and exclusion criteria may apply.