There have been only 10 recorded cases of this phenomenon.
Kate and Peter Hill had only one thing missing in their married life—children. Unfortunately for the couple, Kate was suffering from polycystic ovarian syndrome, making it hard for them to conceive. It was until Kate started taking hormone treatment that she finally became pregnant—but she never expected this to happen.
Ten days after conceiving their first baby, doctors told Kate that she was pregnant once again. They told her that she had two babies in her womb, but they aren’t twins. The conception is called superfetation, which essentially means she fell pregnant while already pregnant.
Kate said: ‘I had fallen pregnant and my body had spontaneously released another egg giving the embryos different gestational ages.’
She adds: ‘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 fertilise the second egg released.’
The rare conception started as a single pregnancy with twins, before she conceived again 10 days later to be pregnant with triplets. Sadly the couple lost one of the babies early on in the pregnancy, and her babies Charlotte and Olivia were given two different due dates: December 20 and December 30 2015.
Their adorable girls were born together two days before their scheduled caesarean. They measured very differently in size, weight and gestational development.
They are now 10 months old, and their loving parents told Today Tonight they have different blood types.
What is superfetation?
Superfetation, described in simple terms, is actually getting pregnant—while already expecting. It is claimed to be common in some species of animals, but is extremely rare in humans. Two different foetuses inside the womb are in different developmental stages. This means that one of the babies was conceived a few days earlier.
Sources BBC TheSun