Early childhood spans ages 2-6 years, a time of remarkable physical, cognitive, social, and emotional development. Physical development focuses on gross motor skills like walking, running, and balance and fine motor skills involving hands and fingers. It follows patterns where large muscle groups develop before small muscles, core body areas before outer regions, and development proceeds from head to toes. Children reach important milestones at each age like walking at 2, jumping at 3, and riding a bike at 5 that demonstrate their physical growth and skill development during these formative years.