An Australian woman is being hailed a medical miracle after falling pregnant while already pregnant. This phenomenon, known as superfetation, is so rare that there are only 10 recorded cases of it in medical history.
Kate Hill was diagnosed with polycystic ovarian syndrome in 2006, leaving her unable to ovulate, according to The Sun. She and her husband, Peter, turned to hormone treatment in an effort to conceive a child.
The treatment was a success and Hill was declared pregnant. However, 10 days later at their next ultrasound, the couple's doctor was astonished to find that there was a new developing baby in Hill's womb. Hill conceived again, meaning that she became pregnant while already pregnant. Women do not usually ovulate while pregnant, making Hill's second conception close to a medical miracle.
"Superfetation is extremely rare – I had fallen pregnant and my body had spontaneously released another egg giving the embryos different gestational ages," Hill told The Sun. “What makes this case even more rare, is that my husband and I only had intercourse one time – his sperm stayed alive for 10 days to fertilize the second egg released."
The couple's obstetrician had never encountered anything like it and had a tough time finding any information on Hill's double conception, according to Us Weekly.
"I could not find any literature in the medical review websites at all," said Dr. Brad Armstrong, from Brisbane's Greenslopes Private Hospital. “I had to go and Google it."
There were no complications in Hill's pregnancy, and she gave birth to the non-identical twins in December 2015.
"They are definitely little miracles," said Hill.
The Sun reports that the twins varied in weight, height and gestational development. They also had different blood types.
About the rare conception, Peter joked: "Hole in one."