Description: Developmental milestones are physical, cognitive, and social-emotional skills that children and adolescents develop over time, from infancy to young adulthood. These milestones vary depending on age, and include important phases such as speech and language #development, motor skills and coordination, and the ability to form relationships with peers and adults. Milestones serve as important markers of a child's development, and are often used to identify potential #delays or disorders, as well as to guide parents and caregivers in providing appropriate support and stimulation for healthy growth. This resource, developed by MSDE, is to provide #developmental_milestones of children from birth through adult.