Pregnant women are told to avoid a long list of substances to avoid injury to their babies. Many doctors have recommended limiting caffeine intake, although there were no long-term studies demonstrating actual harm to babies. A new study, however, finds that consuming a moderate amount of caffeine during pregnancy will not affect a child’s intelligence.

The study was done at Nationwide Children’s Hospital in Columbus, Ohio, where researchers analyzed the amount of caffeine in the blood of over 2,000 pregnant women. The expectant mothers were part of the Collaborative Perinatal Project, conducted at multiple locations around the U.S. It looked at caffeine consumption between 1959-74, when there was little concern about caffeine safety, and followed the babies over a period of years to measure IQ and other health issues in the children born of these women.

Dr. Mark Klebanoff, who led the research team, concluded that “we did not find evidence of an adverse association of maternal pregnancy caffeine consumption with child cognition or behavior at 4 or 7 years of age.” The study also looked at whether caffeine consumption during pregnancy increased the child’s risk of obesity, something that some clinicians were concerned about. The conclusion was that there were no links between caffeine consumption and obesity in the children studied.

So if a pregnant woman is feeling sleepy or tired, it is fine to relax with a cup of coffee once in a while. And Starbucks won’t have to post warning signs in its shops like bars do regarding alcohol and pregnancy.