Infants at age 3 months who had newborn blood levels of 25-hydroxyvitamin D -- a measurement of vitamin D less than 25 nanomoles per liter (nmol/L) were twice as likely to develop respiratory infections as infants who had levels at 75 nmol/L or higher, according to an international study.
That finding is based on umbilical cord blood samples taken from more than 900 infants to measure blood vitamin D levels. Previous research has suggested that mothers who have higher levels of vitamin D in their blood during pregnancy are more likely to give birth to infants who are at a lower risk for wheezing.
Investigators led by Carlos Camargo, MD, DrPH, an associate professor of drug and epidemiology at Harvard Medical School, examined whether vitamin D levels in the infants’ umbilical cord blood were associated with risk for respiratory infections, wheezing, or asthma.
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