Here are some important questions and answers about growth and development in pediatrics, along with explanations, according to NCLEX-RN Mosby: Infancy (0-1 year) 1. Q: What is the primary source of nutrition for infants during the first 6 months? A: Breast milk or formula. Explanation: Infants require a diet rich in nutrients for growth and development. Breast milk or formula provides essential nutrients. 2. Q: At what age do infants typically start teething? A: Around 6 months. Explanation: Teething is a significant milestone in infant development, and it usually starts around 6 months. Toddlerhood (1-3 years) 1. Q: What is the average height gain for toddlers per year? A: 2-3 inches (5-7.5 cm). Explanation: Toddlers experience rapid growth and development, including height gain. 2. Q: At what age do toddlers typically start using simple sentences? A: Around 2 years. Explanation: Language development is a critical aspect of toddlerhood, and simple sentences usually emerge around 2 years. Preschool Age (3-5 years) 1. Q: What is the average weight gain for preschoolers per year? A: 3-4 pounds (1.4-1.8 kg). Explanation: Preschoolers continue to grow and develop, including weight gain. 2. Q: At what age do preschoolers typically start showing an interest in cooperative play? A: Around 4 years. Explanation: Social development is essential during preschool age, and cooperative play usually emerges around 4 years. School Age (6-12 years) 1. Q: What is the average annual increase in height for school-age children? A: 2-3 inches (5-7.5 cm). Explanation: School-age children continue to experience growth and development, including height gain. 2. Q: At what age do school-age children typically start developing a sense of industry vs. inferiority? A: Around 7-8 years. Explanation: Psychosocial development is critical during school age, and the concept of industry vs. inferiority usually emerges around 7-8 years. Adolescence (13-19 years) 1. Q: What is the average annual increase in height for adolescent males? A: 3-4 inches (7.5-10 cm). Explanation: Adolescents experience rapid growth and development, including height gain. 2. Q: At what age do adolescents typically start developing a sense of identity vs. role confusion? A: Around 14-