How is the baby's immune system formed?

"What is the immune system? How does it affect the body? is the question of many people. In simple terms, the immune system is a collection of white blood cells, lymphocytes in the blood, lymph nodes, bone marrow and spleen, which have the same task of protecting the body from the invasion of germs, the site of feces. The major distribution of the immune system is at the entrances of the body, especially in the respiratory and digestive tracts.

The immune system by producing antibodies or destroying itself by destroying enzymes, phagocytosis, invading agents from outside such as viruses, bacteria, fungi and parasites will be localized and destroyed. kill, not cause disease. Any cause that causes a child's immune system to be damaged, and no longer ensures this function, it will be called immunodeficiency syndrome.
In adults, the immune system is built and strengthened through times of illness, by the principle of remembering, when creating the right antibodies to destroy an antigen, the body will remember and use it for Next time, when those agents re-enter, this mechanism is called active immune system.
In infants, the immune system in the first months of life is inherited by the line of antibodies received from breast milk, this mechanism is called passive immunity, antibodies will decline very quickly after 6 months and when the baby is born. Weaning begins, so at this time, babies often get infections and this is an opportunity to build their own proactive immune system. However, for some strains of bacteria that are highly virulent and cause severe illness, parents need to actively prevent their children by vaccinating them.
When the body has a weakened immune system, ie the defense and defense system is no longer available, it is easy to be attacked by pathogens, at this time, the infection is often prolonged or repeated. , in the long term, the anatomical or functional organization of the body is also affected, reducing vital activities.