The blood of infants under 2 years differs normally in certain of its characteristics from that of adults. The hemoglobin, relatively high for a time after birth, rapidly falls to a minimum of 55 or 60 per cent, in the first three weeks, then gradually rises to 70 per cent. at about six months, where it remains during the rest of infancy. There are, moreover, normally great variations in different individuals and in the same individual at different times. The number of red corpuscles is somewhat larger than in adults, averaging between 5,500,000 and 6,000,000 per c.mm. During the first few weeks of life there is more or less variation in the size and shape of the red cells, and nucleated forms, are not very unusual during the first few days. The number of white corpuscles per c.mm. is somewhat larger than in adults, averaging from 10,000 to 14,000. The
MORSE JL. ANEMIAS OF INFANCY. JAMA. 1909;LII(6):455–463. doi:10.1001/jama.1909.25420320027002d
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: