Findings of previous investigators led to the hypothesis that the distribution of alert wakefulness in relation to feeding is altered by the type of feeding regimen used. This study compared behavioral states of 30 demand-fed and 30 schedule-fed newborns observed during a single feeding-to-feeding period.
Gaensbauer TJ, Emde RN. Wakefulness and Feeding in Human Newborns. Arch Gen Psychiatry. 1973;28(6):894-897. doi:10.1001/archpsyc.1973.01750360104016