Human growth and development of age-stage breakdown

Growth and development stage and there is a process of continuous process. In this process there are changes in the volume, but also a qualitative change, creating a different stage of development, the stage has a certain characteristics. Based on these characteristics, combined with different living conditions, they were the growth and development process is divided into several stages.

(1) embryo development: general from 8 weeks of pregnancy for the period of embryo development. From the fertilized egg to start dividing up the whole shape and form endoderm, ectoderm, mesoderm three-tier organization.

(2) of the fetal period: 8 weeks of pregnancy until birth. With a view to the organ and the rapid growth and maturing as a function of the characteristics. In the fetal period can be measured function of the placenta and amniotic fluid examination of the chromosome, enzyme and the amount of biological and chemical content, such as the abnormal situation should be prevention and treatment in a timely manner. If necessary, feasible, abortion, birth so as not to harm the family and society.

(3) neonatal period: from fetus to start delivery within 28 days after birth. Newborn outside the womb to adapt to the new environment has undergone tremendous changes in the anatomy of physiology. The whole system to mature from the beginning of construction is the consolidation of the characteristics of this period.

(4) infancy: Health refers to a later age. Infancy is characterized by fast growth in particular. 1 year, weight at birth is three times body length at birth up to 2 times. This period must be to strengthen the nutrition elements in order to prevent malnutrition and indigestion. Otherwise, prone, such as rickets.

(5) Early Child Care at 1-3-year-old. This period of physical growth faster than the slow gradual infancy, but the language, action and clear communication skills development. Skull before the closure, a deciduous Qi, can be controlled by the toilet. In the case of post-weaning nutrition supply does not take this seriously, and often can be caused not by height or less by.

(6) early childhood :3-6, 7 years old. At present, the equivalent of "kindergarten" stage. This period is characterized by slow growth and development, action, language and gradually increase the capacity to jump, boarding stairs, singing, drawing, the beginning of literacy learning. Often out of curiosity, to ask again. Careless also prone to accidents.

(7) childhood :6,7-11, 12-year-old. Also known as primary school age period. This period is characterized by the brain's basic structure, rapid progress in mental development, a comprehensive analysis to better understand themselves. This period to ensure adequate nutrition, physical exercise to strengthen.

(8) puberty (the adolescent): about 10-18 years old (female early and late men, a difference of about 2 years). This is the transition to adulthood of childhood developmental stages. At this time is characterized by: First of all, physical development To speed up, then the reproductive system mature. Adolescent women generally 11-12 years old to 17-18 years old, compared with men aged 13-15 to 19-21 years old. Here there are individual differences, and with the region, climate, environment and race-related.

(9) adolescence: about 16-20 years old. This period is characterized by active thinking, intellectual development, to start training for independent living, participate in social activities more complex, but easily changeable emotional, psychological abnormalities may occur, it should be the appropriate induction and education.

Over the age period in accordance with the order of convergence, not jumping. Period of the previous age of development for the latter period of age lay the necessary foundation for development. At any stage of development by the obstacles, the latter would have a negative impact on stage.