Abstract
Heart rates of 256 newborn infants were measured on the second day of life. Black babies were found to have much higher heart rates than white babies. When socioeconomic status was taken into account no heart rate differences were found between black and white babies in the poorest social class. Neither the emotional health of the mothers nor the physical health of the mothers or infants was related to newborn heart rate levels. Several hypotheses are suggested to explain these differences.
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