Developmental disorders may occur even before the birth of the baby. In such cases, severe pathologies appear: microcephaly (underdevelopment of the brain when its mass does not reach 1 kg); hydrocephalus (an increase in brain volume due to a violation of the outflow of cerebrospinal fluid from it).
More often, diseases of the nervous system are the result of adverse external influences. Some bacteria and viruses can invade the central nervous system, causing severe infectious diseases: meningitis, polio, rabies, and tetanus.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.