This document outlines the healthy development of a child from birth to age 14 across physical, cognitive, and social/emotional dimensions. Key developmental milestones include gaining weight and sitting with support at 8 months, saying first words and enjoying dropping objects at 12 months, learning to use the toilet at 2 years, distinguishing colors and having long attention spans at ages 4-5, having a small group of friends and less frequent anger outbursts at ages 6-8, soaking up information and having an excellent vocabulary at ages 8-10, and showing increased interests in boys and sexuality at ages 12-14.