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Infants were classified as overweight if they fell into or above the 95th percentile on the World Health Organization's growth charts. To collect growth measurements, scientists measured infant height and weight and determined their body mass index. Researchers extracted three nights' worth of data at the one- and six-month marks while parents kept sleep diaries, recording their children's sleep and wake episodes. They then monitored their sleep patterns using ankle actigraphy watches, devices that measure patterns of activity and rest over multiple days. "In this study, we found that not only shorter nighttime sleep, but more sleep awakenings, were associated with a higher likelihood of infants becoming overweight in the first six months of life." To conduct this research, Redline and colleagues observed 298 newborns born at Massachusetts General Hospital between 20. "While an association between insufficient sleep and weight gain is well-established in adults and older children, this link has not been previously recognized in infants," said study co-author Susan Redline, MD, MPH, senior physician in the Division of Sleep and Circadian Disorders at the Brigham. Their findings of the study have been published in the journal Sleep. New research from investigators at Brigham and Women's Hospital, Massachusetts General Hospital and collaborators suggests that newborns who sleep longer and wake up less throughout the night are less likely to be overweight in infancy.