Early childhood is a stage of human development that generally includes toddlerhood and the years afterwards. It is defined as the period from birth until approximately 9-12 years old, covering infancy, preschool, and the early elementary school years. Experiences in early childhood have a profound impact on brain development and skills like learning, communication, and collaboration that are important for future success. However, inadequate nutrition, lack of early learning opportunities, and exposure to stress can negatively impact development. Understanding the importance of investing in early childhood is key to maximizing children's future well-being.