Blood Cells in Healthy Young Infants

Since these studies were started, in 1931, there have appeared a number of papers dealing more or less extensively with the changes in the red blood cells of healthy infants. Windle 1 recently published an interesting review on prenatal blood development and the changes in the blood picture at birth. The general picture after birth, together with the range of values at different age levels, has been presented most adequately in articles by Josephs, 2 Mugrage and Andresen, 3 Guest, Brown and Wing 4 and Faxen. 5 Several of these authors, notably Josephs and Faxen, discussed postnatal adjustments and have included adequate bibliographies. Although the desirability of studying individual babies through the early weeks of life has been mentioned by a number of workers, there seems to have been a paucity of such material published. This fact serves as justification for adding to the overcrowded current literature further articles on