The parents of three-year-old conjoined twins face a difficult decision because their daughters are growing too big for the heart they share
Doctors have suggested the operation should take place in one to two years' time, with both girls likely to need heart transplants and one a new liver.
Emma and Taylor's parents said there was "a tiny window of time" to decide on whether to go ahead with the surgery.
"We have to get it completely right, if we wait too long then the operation cannot go ahead," Mandy said.
If the operation is successful, it will be the first time twins born with one heart will have been separated.
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