The document discusses early childhood development from birth to age 18. It covers the factors that influence development, including nature (genetics) and nurture (environment). Development occurs across four main areas: physical, cognitive/intellectual, emotional, and social. Key theorists like Piaget are mentioned in regards to stages of cognitive development. Preschool-aged children from ages 3-6 are characterized, with examples of typical abilities and behaviors at different ages. Overall principles of growth and development are outlined such as maturation, progression from simple to complex, and variability in individual rates of development.