Cancun residents have crowded the nursery ward's window to see Antonio Vasconcelos, who was born early Monday by Caesarean section at Jesus Kumate Rodriguez hospital.
On Thursday, doctors reduced his diet from 5 ounces to 3 ounces of milk every three hours. In three days, Tonio gained 7 ounces, weighing in Wednesday night at 14.5 pounds. He measures 22 inches in length.
"We haven't found any abnormality in the child. There are some signs of high blood sugar, and a slight blood infection, but that is being controlled so that the child can get on with his normal life in a few more days," Narciso Perez Bravo, the hospital's director, said on Wednesday.
In Brazil, a baby born in January 2005 in the city of Salvador weighed 16.8 pounds at birth. According to Guinness World Records, the heaviest baby born to a healthy mother was a boy weighing 22.5 pounds, born in Aversa, Italy, in September 1955.
Antonio's mother, Teresa Alejandra Cruz, 23, and father, Luis Vasconcelos, 38, said they were proud of the boy, and noted that Cruz had given birth to a baby girl seven years ago who weighed 11.5 pounds.
"It's good, because now with this one, we'll have a pair" of big babies, said Vasconcelos.