A mother of four is claiming she was left fighting for life when she developed cancer stemming from her baby son's hidden unborn twin.

Leanne Crawley, 38, had no idea she had been pregnant with twins until she was rushed to the hospital with heavy bleeding six weeks after baby Louee was born.

Louee arrived “grey and lifeless” and was whisked to the antenatal unit where he spent three weeks on life support, with devastated Leanne, 38, at his side.

Then, six weeks after the birth, doctors found Louee had been “hiding” a second pregnancy.

His “twin” was not viable but had left behind a rare, fast-growing cancer — and the cells had spread to Leanne’s lungs.

While she should have been home with her newborn, she spent a month in hospital undergoing 20 blood transfusions followed by five months of chemotherapy.

Leanne, a full-time mum, fell pregnant with Louee a few months after giving birth to daughter Francesca, now two, with long-term partner Andrew Smith, 28.

Her scans looked normal — but Louee was not breathing when he arrived in December 2016.

Louee spent more than three weeks in hospital — on life support, in a cooling machine and in an incubator. His organs had begun to shut down due to losing 80 per cent of his blood and he was put in an induced coma and given donor blood to bring him back to health.

But Leanne says: “Two days after he came home, I was still bleeding heavily and was rushed to hospital where medics operated to remove what they thought was part of Louee’s placenta — but it was part of the molar pregnancy. It was terrifying. I had no idea what was going on.”

Doctors discovered she had been "hiding" a second pregnancy, which was then removed — but left behind a very rare fast-growing cancer.

The cells spread to her lungs, Leanne went on to have 15 hours of chemo a week and 20 blood transfusions. She nearly died when a blood clot travelled to her lung while in hospital.

Just five weeks after Leanne started her chemo, she also lost her hair. She says: “It was horrible, a constant reminder I had cancer.

“When I woke up in the morning I would forget for a few seconds then I’d see myself in the mirror. Part of my identity had been taken away.”

Leanne, now in remission, says she would do it all again 'if it was a choice between me and Louee'.