Jonathan Patrick Rozzi was born healthy, rosy-cheeked and nearly twice the size of an average newborn. He weighed in at 13 pounds, 2 ounces, and measured 22 inches long.
"The doctor said it's the biggest she's delivered naturally, and the nurses were all so surprised at his size. I was told the last big baby was 12 pounds, but that was a C-section," she told the Boston Herald.
"Everyone's asking me, 'How did you do it?' It wasn't as much pain as I thought it would be. So I just smile and shrug," she said.
Byron says the attending doctor wanted to snap a few photos of the new baby. "Wait, I have to go get my camera," her doctor told her, according to WCVB-TV, the local ABC affiliate.
The new mother said neither she nor fiance Eric Rozzi was a very big baby and noted that she ate well throughout her pregnancy.
"They don't know why he's so big. I had a normal, well-balanced diet -- avoided caffeine and sodas," she told the Herald.
He said his son is already famous among the staff at Holy Family Hospital in Methuen, Mass., about 30 miles northwest of Boston.
"Doctors kept coming in, and when we put the baby in the nursery, people kept coming and walking by the window and saying, 'Well, this is the big baby.'"
The average newborn is about 7.5 pounds.