The document outlines the healthy development of a child from birth through age 14 across physical, cognitive, and social/emotional dimensions. Key developmental milestones include learning to sit up and gain weight from 0-3 months, saying first words and enjoying dropping objects at 12 months, learning to use the toilet and stack objects at age 2, having emotional outbursts when not getting their way at age 3, having long attention spans and finishing activities from ages 4-5, and showing increased interest in boys and spending time with friends from ages 12-14.