Baby’s growth and development mainly includes seven stages, including embryonic development, fetal stage, infancy, early childhood, preschool, school age, puberty and other stages. 1. In the embryonic and fetal stages, the baby is in the mother’s womb and gradually develops from a fertilized egg into a full-fledged embryo, and with the passage of time, all organs of the body will grow and develop normally. 2. Infancy and early childhood, in the height and weight of the rapid development of the stage, the body of all systems and organs are continuing to develop, but also has a certain cognitive ability, rapid development of intelligence, the scope of activities and contact with things also gradually increased. 3. In the preschool and school-age stages, physical growth and development slow down, but cognition, language, intelligence, movement and other aspects of the further synergistic development of intellectual development more rapidly, with a certain degree of self-care ability, can accept the system of scientific and cultural education. 4. The hormone level in the body changes during puberty, and there will be the symptom that the second developmental characteristics are obvious, and gradually there are gender differences. Babies in each stage of growth and development have their own characteristics and certain regularity, if there is any abnormality, it is recommended to consult a doctor in time.