DEVELOPMENTAL MILESTONES (BIRTH - 1 YEAR) - In ascending order: displays social smile; rolls over by self; able to sit alone without support; babbling; plays peek-a-boo; eruption of first tooth; pulls self to standing position; walks while holding on to furniture or other support; says mama or dada in proper situations; able to drink from cup; understands "NO" and will stop activity in response; walks without support