Most of the babies suffering from rickets are 3 to 24 months old. These patients have a lower growth rate than their peers and are more prone to emotional outbursts in general, and the respiratory tract of these patients is more prone to infections. The mother did not supplement enough vitamin D in time when she was pregnant, because when the baby is still an embryo, the nutrients mainly rely on the mother to provide, when the mother does not supplement enough vitamin D, the baby in the belly naturally does not have enough vitamin D, and vitamin D deficiency is easy to suffer from rickets. Another thing is that the baby sunshine time is not enough, nowadays, in the city life, there are many tall buildings, blocking the natural sunlight, and the air quality is also bad, so many parents will not often take the baby out in the sun, which makes the baby’s body vitamin D can not be synthesized properly. At the same time, infants’ own intestinal tract and liver, gallbladder and kidney diseases can also affect the absorption and utilization of vitamin D in babies. These diseases can affect the activity of liver and kidney hydroxylase, thus making the utilization of vitamin D. So in order to target rickets, we should focus on prevention, during the mother’s pregnancy, pay attention to supplementation, and after the baby is born, let the baby get more sunlight, but also to avoid strong direct sunlight.