-- Katherine Kropas had no idea she was pregnant with a 10-pound baby until an hour before she gave birth.
"They took one look, and they rushed me off into labor," she told ABC's Boston station WCVB. "I found out that I was having a baby at 10:15. She was born at 11:06 p.m."
Ellie's grandmother, Karen Kropas, told WCVB she's heard of this happening, but never thought she would see it firsthand.
"You laugh and you say that's ridiculous," she told the station. "And then it happens to you, and you're like, 'This really does happen.'"
Dr. Jennifer Ashton, a senior medical contributor for ABC News and practicing OB/GYN, said she's seen cases like Kropas's in her career.
"It tends to happen in women who are overweight or obese to start, may have irregular periods and are less aware of their bodies," Ashton said. "For most women who have been pregnant, they are aware of multiple physical signs and symptoms, and those signs and symptoms are not subtle."
She said though this case is incredible, it's far from desirable.