Differential Serum Vitamin B12Concentrations in Mothers and Infants

IN a previous communication,1 a steady decline in the serum vitamin B12 concentrations during pregnancy was reported. Even as early as the first trimester, the serum concentrations of vitamin B12 were found to be significantly lower than those for normal women of the same age. During the course of this study,1 a personal communication was received from Dr. Bacon Chow, of Johns Hopkins University School of Hygiene and Public Health, indicating that a difference in the serum vitamin B12 concentrations of mother and infant had been observed.2 Accordingly, the investigation reported here was undertaken to confirm and . . .