A key movement behavior or an identifiable state of organization of body parts or the whole body that appears during the first years of life and is used to signal that development is proceeding normally. Examples of motor milestones include sitting, crawling, standing and walking. Typically, these achievements are classified as gross motor abilities in contrast to fine motor abilities.
See Crawling, Developmental delay, Fine motor abilities, Fundamental movement pattern, Gross motor abilities, Motor ability, Motor development, Motor skill, Movement, Movement coordination, Walking