Longitudinal study of sleep behavior in normal infants during the first year of life.

Study Objectives: To longitudinally examine sleep patterns, habits, and parent-reported sleep problems during the first year of life.

Methods: Seven hundred four parent/child pairs participated in a longitudinal cohort study. Structured interview recording general demographic data, feeding habits, intercurrent diseases, family history, sleep habits, and parental evaluation of the infant's sleep carried out at 1, 3, 6, 9, and 12 months.