Experiments have found that proper vitamin D supplementation for pregnant women can reduce the risk of neonatal infection with respiratory syncytial virus  Researchers tested the content of vitamin D in umbilical cord blood of 156 newborns  Among them, 54% of newborns were diagnosed with vitamin D deficiency  Among them, 12% of the children were infected with respiratory syncytial virus within one year after birth
The similarity between the newborns selected by the researchers in the experiment and the general newborns in other aspects has not been clearly verified
 The proportion is much higher than that of children with normal vitamin D