Abstract
A group of 530 healthy infants were studied in regard to reactions to diphtheria,pertussis, and tetanus (DPT) immunization and smallpox vaccination, feeding and behavioral habits, and sleep patterns during the first 2 years of life. The incidence of reactions following DPT immunization and smallpox vaccination were 19.8 per cent and 20.1 per cent, respectively. A positive family history of allergy appears to be of no assistance in attempting to predict these reactions. Colic occurred more frequently among bottle-fed infants (20.9 per cent) than among breast-fed infants (10.8 per cent). A longitudinal study of the sleep patterns of these infants during the first 2 years of life provides a basis for answers to mothers' traditional question: “How many hours a day should my child sleep?”
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