Abstract
A total of 262 eosinophil counts were done on a series of 57 infants. The mean level was 267 at birth and 483 at 1 month of age. The eosinophil count rose significantly in the first week of life in 75% of 44 infants. Eighty-two per cent of 28 infants showed a significant rise in eosinophils from 5 to 30 days of age. The marrow of newborn infants was relatively rich in myelocytic and rubrocytic elements and low in lymphocytes. At 30 days of age the marrow showed a significant and reciprocal change in the relative proportions of these elements. The infant's eosinophil pattern in the first week after birth was variable and erratic. It differed quantitatively and qualitatively from that of his mother.
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