Human growth and development is divided into eight stages, each of which is of great importance to the growth of an individual, specifically: fetal period, neonatal period, infancy, early childhood, preschool, school age, adolescence, and adulthood. 1. Fetal period: This period lasts from the formation of the fertilized egg to the delivery of the fetus, usually 40 weeks. It is a critical period of physical development before birth and is easily affected by other factors, requiring special attention. 2. Neonatal period: This period is counted from the time the fetus is delivered from the mother, within 28 days of the neonatal period. 3. Infancy: from the delivery of the fetus until the baby’s first birthday is the infant period, the individual’s nutritional needs during this period is relatively high, the growth rate is relatively fast. 4. Early childhood: from 1 week to 3 weeks of age belongs to the early childhood period. Individuals in this period are active and energetic. 5. Pre-school period: from 3 weeks of age to before entering elementary school is the pre-school period. Individuals in this period gradually increase their intellectual and physical development. 6. School age: from the age of 6~7 years old to start school until puberty is the school age. They begin to receive systematic education. 7. Adolescence: generally 10 to 18 years old, girls start relatively earlier than boys, the period of the child’s physiological and psychological changes in the period. Physical growth, secondary sexual characteristics and reproductive system development gradually perfect. It is a transitional stage in the transition to adulthood. 8. Adulthood: After the age of 18 belongs to the adulthood, also called the adult period, the individual aspects have been perfected, belongs to the process of life in the longest period. The whole life of a person can be divided into these eight stages, each stage not only affects each other but also has a great significance for individual growth.