Donna Grove, 27, delivered Seth at 28 weeks at Frimley Park Hospital in Camberley, Surrey, after a series of complications with her pregnancy. He was not breathing, and went on to develop a potentially fatal intestine infection, a heart murmur and blood poisoning.
He was transferred to St Mary's in Paddington, where Donna joined him the following evening, still pregnant with his twin brother. Fifty hours later, she gave birth to baby Preston, but suffered a cardiac arrest after some of his womb sac fluid infected her blood stream.
Meanwhile, Seth's condition had worsened and he was taken to a specialist neonatal intensive care unit at London's Chelsea and Westminster Hospital.
Doctors said the odds of the three of them surviving were a million to one. Dad James Campbell, 26, said: 'The evening after the second birth was a dark, dark time. I feared I was going to lose them all.'
Donna told reporters: 'I feel blessed. We are all really really lucky to be here.'
Painter and decorator James was so overwhelmed by the twins' delivery that he proposed to Donna as she recovered from the traumatic labour.
Wow! What an amazing outcome!