Conjoined twins Emma and Taylor Bailey strike a pose at home in Phoenix, Arizona.

The Bailey twins share a heart and a liver, when they were born they were only expected to live for 15 minutes.

Doctors told the couple, who have six children, that their lungs would rush their heart from the moment they took their first breath and it would kill them. But the girls survived and are now three-years-old.

The girls are fused from their breastbone to their bellybutton, but despite being fused together, they’re developing their own personalities.

Their mother Mandy says: “Emma prefers to look at books and do puzzles, and Taylor would rather have a stuffed toy and play with building blocks. They are developing funny adorable little traits, for example Emma is picky, and Taylor will eat anything.”

But the Bailey family face a terrible dilemma, as the girls get bigger there is more strain on their heart, but separating then would almost certainly result in death for one of the two.

That said, their parents say separation won’t be considered unless both the girls will survive and be healthy.