The Grio Reports:
Babies born larger than 9 pounds 15 ounces have a much higher risk of complications. As many as 10 percent of newborn babies weigh-in above that at birth.
The mothers are at increased risk as well. Major lacerations or tears along the vagina or the urinary tract can occur. Having a newborn with macrosomia increases the need for Ceasarean section, involving the risks of major surgery. The mothers can also develop diabetes later on in life.