Preterm birth is a leading cause of infant mortality. Babies born before 37 weeks face a variety of health issues. Many grow up to be perfectly healthy, but a new study reveals some will experience certain health problems as they grow older. Babies born 22 to 27 weeks had a nine to ten times higher chance of mortality, than full term babies. While studying reproduction rates, they found men were less likely to reproudce if they were born prematurely compared to women. That could be because medical problems or diminished cognitive ability could make it more difficult for preterm babies to find a mate.