There's been lots of medical debate of late about the effect of moderate alcohol on the babies of pregnant women. While most doctors insist that even minimal alcohol use poses tremendous dangers to growing fetuses, other M.D.s insist these dangers have been wildly overblown. Now a new study of 60,000 pregnant women in Ireland adds more fuel to the fire. Researchers report that women who drink more than 20 units of alcohol per week—roughly a large glass of wine each day—experience three times the number of premature births as light drinkers and non-drinkers.The study, published in the respected journal BMC Pregnancy and Childbirth showed that women who drank 0-5 units of booze per week did not suffer the same effect, although the scientists were quick to caution that “further research is necessary before even low amounts of alcohol can be considered safe.” Researchers said the heaviest drinkers in the study were first-time mothers, not surprising considering the link between alcohol and unprotected sex. Although the study diagnosed very few cases of Fetal Alcohol Syndrome in babies born to drinking mothers, researchers warned that heavy drinking “was associated with very preterm birth rates"—with drinking mothers giving birth at an an average of 32 weeks before gestation.