A baby who was born at 23 weeks weighing just 1lb 4oz has been discharged from hospital.
The parents of Jacob McMahon have been told he is the most premature twin ever to survive in the UK.
His sister, Emie, was born at just under 22 weeks but did not survive.
Parents Sara Fisher, 25, and Scott McMahon, 26, were told their son’s chances of survival were also low when he was born at Bradford Royal Infirmary on 22 February.
But now Jacob has been allowed to go home.
Ms Fisher told the Telegraph and Argus, in Bradford, how her son now weighs 7lb 3oz.
The couple said Jacob spent five months in a special care baby unit. Ms Fisher said that she could not even hold him for more than four weeks.
She said he is still on oxygen and doctors are on the lookout for possible long-term health problems, but the family are grateful to be home.
Ms Fisher said that the fact he is a twin makes him “special”, but they will never forget his sister.
The family praised hospital staff and the unit which cared for Jacob.
“If it wasn’t for them he wouldn’t be here,” Ms Fisher said.