Rachitis - disease of children of early age at which in connection with deficiency of vitamin D are broken a calcium-phosphoric an exchange, processes of an osteogenesis and a mineralization of bones, and also functions of nervous system and internal organs.

The factors contributing to development of a rachitis from mother: age less than 18 and more 36 years, toxicoses of pregnant women, metabolic diseases, a pathology of organs of a gastrointestinal tract, kidneys, disturbances of a delivery during pregnancy and lactemias (deficiency of vitamin D, fiber, a calcium, phosphorus, vitamins of group), non-observance of a regimen of day (an insufficient insolation, a hypodynamia), the complicated labors, unsuccessful social and economic conditions.

The factors contributing to development of a rachitis from the child: time of a birth (children born from June till December) is more often are ill, a prematurity, the greater mass at a birth (more than 4 kg), a "rough" increase in mass within the first 3 months of a life, feeding by milk of the wet nurse or the early artificial and admixed feeding by the not adapted milk admixtures, insufficient stay on fresh air and an impellent regimen, diseases of a skin, a liver, kidneys, frequent catarrhal diseases and intestinal infections, reception of some medicinal preparations, etc.
 
The beginning and exacerbation of illness are observed, as a rule, in the late autumn, in the winter and in the early spring. The rachitis usually on 2-3 month of a life and by 5-6 months if treatment and prophylaxis when the expressed acidosis develops are not spent begins, rough advance of all signs is observed.