Caffeine use affects pregnancy outcome.

A sample of 750 women were interviewed during pregnancy on their depression and anxiety symptoms, substance use and demographic variables. A subsample was seen again at the neonatal stage (n = 152), and their infants were observed for sleep-wake behavior. Symptoms of depression and anxiety were related to caffeine use. Mothers who consumed more caffeine also smoked more often, were younger, were less educated, reported less sleep effectiveness and more obstetric complications. Their newborns were lower birthweight, they spent less time in REM sleep, and they showed more stress behaviors including hiccups, tremors and jerkiness. [ABSTRACT FROM AUTHOR]