The healthy baby, born by cesarian section, weighed 2.9 kilograms (6.4 pounds), said Bogdan Popescu, a spokesman at Bucharest University Emergency Hospital.
Lacatus was admitted there from her village in southern Romania because the local hospital did not have any beds that could bear her weight, officials said. In Bucharest, three teams of ambulance staff and firefighters were needed to carry her into the hospital.
Popescu said Lacatus was being carefully monitored because she suffers from a thyroid problem and doctors said post-surgery complications could develop because of her morbid obesity.
Lacatus said she will soon marry her 36-year-old fiance, Costica Lacatus.
Florin Costandache, who helped perform the operation, said: "It was a real challenge because she needed four times the anesthetic a normal person needs."
The chief surgeon, obstetrician Valeriu Horhoianu, said at least 10 obese women have given birth at the Bucharest hospital, but they all weighed less than 352 pounds (160 kilograms).
In August 2008, a heavier obese woman -- 560-pound (255-kilogram) Leanne Salt -- gave birth to triplets in Britain.
But Nicolae Cernea, a doctor from the southern city of Craiova -- where Lacatus was hospitalized for a month before delivery -- said her case was unique in Romania.
The country's media, which closely followed the case, seemed to agree.
