Mum delivers baby so big doctors thought she was carrying a surprise twin: 'You've had a toddler!'

Picture: Facebook
Picture: Facebook 

If you've been up all night trying to rock your newborn to sleep, spare a thought for Amber Cumberland, who just gave birth to a 13 pound baby.

The first-time-mum, from the UK, welcomed daughter Emilia on April 16 - weighing in at a cool 12 pound, 14 ounces - or 5.89kg. 

Not only is the not-so-tiny tot believed to be the second biggest baby born in Britain, due to the size of her bump during pregnancy, Amber had been warned there was a chance she could be having twins. 

"Doctors thought it was twins during pregnancy because she was so big, even though we could only see one on the ultrasounds," the 21-year-old told The Sun.

"We heard it so much we actually started to believe there was another one hiding in there."

It wasn't until the third trimester when Amber began measuring big, and the new mum was told at 36 weeks her baby was likely already over 8 pounds, or 4kg. 

Picture: Baby Emilia was so big she shocked even Amber's delivery team

Picture: Baby Emilia was so big she shocked even Amber's delivery team

By the time she was eventually induced - two weeks overdue, then underwent an emergency C-section, Emilia's size shocked even her surgical team.

"When she came out Scott's (Amber's partner) face was white and all the surgeons were looking at each other in shock and laughing - they brought her to me and said 'congratulations you've had a toddler'," she told The Sun.

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"We were just so glad it was only one baby and that she was healthy."

So big was baby Emilia, that it took two people to lift her out during the Cesarean and a third to hold Amber's body in place so the baby could fit through. 

Hospital staff also had to source bigger sized nappies from paediatrics and Emilia skipped newborn clothes, going straight into the triple zeros size. 

Picture: Amber was left with severe stretch marks that often bled is irritated

Picture: Amber was left with severe stretch marks that often bled is irritated

Nursing staff also asked Amber to have their photo taken with her bub, because of her size. 

The weight of carrying Emilia, combined with recovering from the C-section, has meant Amber hasn't been able to lift or breastfeed her baby because she is too heavy. As Amber was warned she would need to take extra care due to the damage it did to her stomach muscles, and the stitches. 

But despite the significant muscle damage, Amber said both she and Scott were besotted with their new addition. 

"We're both so overjoyed with our gorgeous little girl," Amber said.