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Vitamin B12 deficiency, mostly of maternal origin in newborns, is a well treatable condition but can cause severe neurologic sequelae. In women of childbearing age and pregnant women worldwide vitamin B12 deficiency has been reported with frequencies of 10%-50%. Children with vitamin B12 deficiency are asymptomatic at birth but may develop severe multisystemic symptoms, including irreversible developmental impairment in the second half-year of life. Early detection of vitamin B12 deficiency allows for presymptomatic treatment. This articl