Mexican parents Salvador and Blanca Rosa de Leon Garcia had a big surprise this week--their baby, Pedro, was born weighing 13 pounds 6 ounces. Pedro was so large that he could not be born vaginally and had to be delivered by Cesarean section. He is approximately the size of a 3-month-old infant. Medical experts estimate babies that big only occur once in every 40,000 births. Compare Pedro's photo to that of the average baby who weighs 6-7 pounds at birth. The Guinness Book of World Records has the largest baby born on record as weighing--are you ready?--24 pounds.