Abstract.Breast feeding is known to be a major cause of vitamin D deficiency in infants because
the content of vitamin D in breast milk is significantly lower than that in formula. We
report a case of a 1-mo-old boy who developed hypocalcemic seizures and dilated
cardiomyopathy caused by vitamin D deficiency despite being fed a sufficient amount of
regular formula. The cause of vitamin D deficiency in this case was maternal vitamin
deficiency due to severe hyperemesis and insufficient sunlight exposure, induced mainly by
the malabsorption of fat-soluble vitamins caused by maternal cholestasis. We should
carefully consider maternal conditions during pregnancy and the postpartum period to
detect and prevent vitamin D deficiency in the fetus and infant.
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