By the twenty-eighth week, the respiratory, circulation, and nervous systems are sufficiently developed so that the fetus can survive if born prematurely.
Well, I wouldn't say they were developed sufficiently. Respiratory Distress Syndrome Respiratory distress syndrome (RDS) primarily occurs in infants born prematurely. Up to 50 percent of infants born between 26 and 28 weeks and fewer than 30 percent of infants born between 30 and 31 weeks develop RDS.
