Until now pregnant women were under the misconception that if they had morning sickness, they were less prone to a miscarriage. Kathleen O'Conner of Pennsylvania State University, University Park, says that morning sickness is simply more frequent in younger women. She randomly selected 708 married women (age 18-47 years) in rural Bangladesh out of which 203 became pregnant. She followed them up and found that age was the only factor that could predict a women's risk of miscarriage. Only younger women who had morning sickness can assume that their pregnancy is safe.