Many parents often complain that their children get sick more often from the time they start eating solid foods until about 3 years old, without knowing the cause. Doctors have given the answer to this problem because this is the period known as the “immune gap” when the child’s immune system is not fully developed, making the child very susceptible to disease due to lack of immunity. So when will the child’s immune system be complete?

The term “Immune System” in English means “immune system” - a system made up of a network of special cells, proteins, tissues and organs. They work together to protect humans against germs and microorganisms in everyday life. The human immune system will attack the factors that cause disease in the human body through a series of steps called the immune response.

The immune system is essential for life, without the immune system, the body would be vulnerable to attack by bacteria, viruses, parasites, etc. The immune system keeps us healthy when exposed to pathogens. The immune system is located throughout the body and involves many types of cells, organs, proteins and tissues. It is important that the immune system can distinguish the body's own tissue from foreign tissue. Dead or damaged cells are also recognized and eliminated by the immune system.