Become informed about the Maryland state child care regulations related to appropriate supervision of children of all ages and stages and learn to take an active role and apply best practices to keep children playing and learning safely. This course is designed to help you get your program aligned with Maryland EXCELS as well as help you reach higher Maryland Child Care Credential levels. Credential Boosters are classes that are identified by the Maryland State Department of Education in the Staff Credential modifications for levels 2, 3 and 4. Maryland State Education Core of Knowledge: 3 hours Child Development.