Anna Bates [the mother of Heaviest Baby Ever Born in the World]. The woman comes belongs from Canada. The Heaviest and largest /biggest baby Ever Born in the World was born on January 19, 1879 in Ohio, USA. The weight of the child is the most wonderful. He is 23 pounds and 12 ounces, the total length is 30 inches child. Unfortunately,the baby died after 11 hours.