Lynlee Boemer with her mother Margaret after overcoming incredible odds to be born

When she grows up, Lynlee Boemer should demand to celebrate two birthdays a year.

For she is the baby who was born twice. Her proper entry into the world came 12 weeks after she was temporarily taken out of her mother’s womb for a life-saving operation.

Doctors discovered a tumour in the tailbone of Margaret Boemer’s unborn baby when the mother-to-be went for a routine ultrasound just 16 weeks into her pregnancy.

Her only hope was a medical procedure that required surgeons to open up the womb and take the 1 lb, 3 oz foetus out for 20 minutes for a do-or-die operation - and then put her back and sew up the uterus.

Mum Margaret was kept on bedrest and the replaced baby made it through another 12 weeks to nearly 36 weeks - full term - before the little girl, named Lynlee Hope, was born for the second time via C-section.

Lynlee weighed 5 lb and 5 oz and, after being whisked away for a check-up, she was moved into the nursery with the other babies.

Margaret, from Plano, Texas, had feared the worst after getting the shock ultrasound results.

‘They saw something on the scan, and the doctor came in and told us that there was something seriously wrong with our baby and that she had a sacrococcygeal teratoma,’ she told CNN. ‘And it was very shocking and scary, because we didn’t know what that long word meant or what diagnosis that would bring.’

Lynlee was actually born twice after doctors were forced to remove her from the whom when she was just 16 weeks old

Doctors discovered a tumour in the tailbone of Margaret Boemer’s unborn baby when the mother-to-be went for a routine ultrasound just 16 weeks into her

During the surgery, Lynlee’s heart slowed down to a standstill but she was kept alive by a specialist while the doctors removed the bulk of the growth

The teratoma is ‘the most common tumour we see in a newborn,’ said Dr. Darrell Cass, co-director of Texas Children’s Fetal Centre and associate professor of surgery, pediatrics and obstetrics and gynecology at Baylor College Medicine. ‘Even though it’s the most common we see, it’s still pretty rare.’

The cause is unknown, although the tumour occurs in girls four times more often than in boys. The growth is seen in only one out of 30,000-70,000 live births.

Sometimes doctors can delay surgery until after the birth, but in LynLee’s case the tumour was competing with the foetus for the body’s blood flow ‘so it becomes a competition,’ said Dr. Cass.

‘And in some instances, the tumour wins and the heart just can’t keep up and the heart goes into failure and the baby dies,’ he added.

Her only hope was a medical procedure that required surgeons to open up the womb and take the 1 lb, 3 oz foetus out for 20 minutes for a do-or-die operation

Margaret was kept on bedrest and the replaced baby made it through another 12 weeks to nearly 36 weeks - full term - before Lynlee Hope (pictured) was born via C-section

The Boemler family (pictured) with their newest addition, Lynlee Hope, after being born for the second time

As the tumour grew bigger, the baby’s health deteriorated until doctors had no choice but to act.

One option was to terminate the pregnancy, a decision made all the more difficult by the fact that Margaret had originally been expecting twins but lost one of her babies before the second trimester.

Margaret said: ‘LynLee didn’t have much of a chance. At 23 weeks, the tumour was shutting her heart down and causing her to go into cardiac failure, so it was a choice of allowing the tumour to take over her body or giving her a chance at life.

‘It was an easy decision for us: We wanted to give her life.’

One option give to Margaret was to terminate the pregnancy, a decision made all the more difficult by the fact she had originally been expecting twins but lost one of her babies

By the time surgeons were given the green light, Lynlee was nearly 24 weeks old and the tumour was almost the same size as the baby.

The operation took five hours, but Dr Cass said: ‘The part on the foetus we do very, very quickly. It’s only 20 minutes or so on the actual fetus.’

By the time surgeons were given the green light, Lynlee was nearly 24 weeks old and the tumour was almost the same size as the baby

Most of the time was taken up cutting into the uterus. Once the surgeons reached the baby she was lifted so she was ‘hanging out in the air.’

‘Essentially, the foetus is outside, like completely out, all the amniotic fluid falls out, it’s actually fairly dramatic,’ explained Dr. Cass.

During the surgery, Lynlee’s heart slowed down to a standstill but she was kept alive by a specialist while the doctors removed the bulk of the growth.

When they had done as much as they could, the surgeons placed LynLee back inside the womb and sewed her mother’s uterus ‘as sealed and as water tight as possible.’

‘It’s kind of a miracle you’re able to open the uterus like that and seal it all back and the whole thing works,’ said Dr. Cass.

At eight days old, little LynLee had one more ordeal on the operating table when the surgeons went back in to remove small bits of the tumour they hadn’t been able to reach the first time and where growing again.