title: Relationship between the vitamin D content of maternal milk and the vitamin D status of nursing women and breast-fed infants.
abstract: This work was designed to study the effect of the vitamin D content of human milk on the vitamin D status of exclusively breast-fed infants, and the relation between milk and maternal serum concentrations of vitamin D during the first month of lactation. Serum levels of calcium (Ca), phosphorus (P), magnesium (Mg) and 25-hydroxyvitamin D (25-OH-D) were determined in a racially heterogeneous population of nursing women, between days 3 and 5 (L3), 15 and 18 (L15) and 30 and 45 (L30) post partum. The same parameters were determined in the serum of 1-month-old breast-fed infants. Maternal milk samples were obtained at L3, L15 and L30 and analysed for Ca, P, Mg, vitamin D and 25-OH-D content. Milk levels of Ca, P and Mg were found to be within the range previously described by other authors. No correlation was found between serum and milk levels of vitamin D and 25-OH-D in nursing mothers. The 25-OH-D concentration in milk was related to its vitamin D content and strongly correlated (P less than 0.001) with the 25-OH-D levels in the serum of exclusively breast-fed infants. No significant changes were observed in maternal serum levels of 1,25-dihydroxyvitamin D (1,25-(OH)2D3) measured at L3 and L30, or between maternal and infant levels of 1,25-(OH)2D3 at L30. This study emphasizes the importance of the 25-OH-D content of maternal milk, in being primarily responsible for the vitamin D concentrations found in the serum of exclusively breast-fed infants.(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D001942:Breast Feeding; D002112:Calcifediol / Q000097:blood; D002117:Calcitriol / Q000097:blood; D002118:Calcium / Q000097:blood; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007774:Lactation; D008274:Magnesium / Q000097:blood; D008895:Milk, Human / Q000378:metabolism*; D010758:Phosphorus / Q000097:blood; D049590:Postpartum Period; D011247:Pregnancy; D014807:Vitamin D / Q000097:blood / Q000378:metabolism*
chemical_list: D014807:Vitamin D; D010758:Phosphorus; D002117:Calcitriol; D008274:Magnesium; D002112:Calcifediol; D002118:Calcium