Vanellope Hope Wilkins, who was born with no breastbone, was delivered at Glenfield Hospital in Leicester on 22 November 2017 by Caesarean section.
She had three operations to place her heart back in her chest.
Vanellope has now left Nottingham’s Queen’s Medical Centre, which she was moved to in May to be nearer home.
She has had a few trips home overnight but now will now be there permanently.
Her mother Naomi Findlay, from Bulwell, Nottingham, said it was “absolutely amazing” and “a massive relief” to have Vanellope home.
“It’s exciting but it’s daunting at the same time,” she added.
“It has been an incredibly long, emotional journey.”
Vanellope requires 24-hour care and is reliant on a ventilator.
Her parents – who said they will get married next year – are taking over much of her care, although they will have help overnight.
Ms Findlay said it was “not quite over yet” but it was a chance for them to be a normal family.
Vanellope’s father Dean Wilkins said: “There is still a lot she has to undergo yet but she is home and that’s the first step.”
Frances Bu’Lock, part of the team caring for Vanellope, said the baby would “need something in the longer term” to give structure to her chest and make her condition more stable.
“Like with all of her care we don’t exactly know what’s going to happen, because nobody’s ever done it before, so we’re going to have to keep an eye on things,” she added.
Staff at Nottingham’s Queen’s Medical Centre have been caring for Vanellope since May
The condition, ectopia cordis, is extremely rare with only a few cases per million births, of which most are stillborn.
When Vanellope’s rare condition was first diagnosed in pregnancy her parents were told she had less than a one in 10 chance of surviving.
However, the experts at the children’s heart surgery unit at Glenfield Hospital defeated those odds.
Glenfield Hospital said it knew of no other case in the UK where the baby had survived.
