The Baby Duchenne Study: Characterizing Developmental and Clinical Outcomes in the First Three Years in Children With Duchenne Muscular Dystrophy

Inclusion Criteria: * Male child between birth and 3.0 years of age at time of enrollment. * A confirmed and documented pathogenic or likely pathogenic variant in the DMD gene. * Ability of parent/guardian to understand and provide written informed consent (signing Parental Permission and Consent Form). * Willingness of parent/guardian to comply with the protocol Schedule of Activities, including all study site visits. Exclusion Criteria: * Female * Presence of any confirmed genetic disease, other than DMD, that could impact early development, which, in the opinion of the PI, may confound interpretation of developmental progress. * Presence of any significant medical condition (i.e., extreme prematurity, hypoxic ischemic encephalopathy) which, in the opinion of the PI, may confound interpretation of the clinical course of DMD. * Inability/unwillingness of parent/guardian to provide written permission (sign PPF) or to comply with the protocol Schedule of Activities.