A milestone is a stone marker, placed along the road, that indicates the distance traveled.     A baby' skills such as taking a first step, smiling for the first time, and waving “bye bye” are called developmental milestones. Clink on this logo to compare your child's development. Resources: - Infant & Toddler Connection of Virginia - CDC - Learn the Signs. Act Early. - CDC - Developmental Screening FACT SHEET - National Dissemination Center for Children with Disabilities - Virginia State Agencies - Council for Exceptional Children - First Signs - Infant Development and Parent Education Services - Southside Community Services Board - Tri-County Community Action Agency, Inc. (Halifax, Charlotte and Mecklenburg Counties)