By Anna Lindsay BBC News, Portsmouth

Charlotte's first visit home without medical staff was on Christmas Day

Darren and Debbie Wyatt began taking the brain-damaged two-year-old on her first day visits to their two-bedroom council flat in Portsmouth last month.

But they said they have been told it is too small for Charlotte to live in with her three other young siblings.

The city council said it was working to find the Wyatts a bigger home.

Portsmouth NHS Hospitals Trust said it was unable to comment.

Charlotte was born three months prematurely in October 2003 weighing just 1lb (0.5kg) and has severe brain, lung and kidney damage, limited sight and hearing, and needs oxygen around the clock.

I don't care where we move, we just want Charlotte home Debbie Wyatt

Her parents have fought a series of court battles with Portsmouth NHS Trust over the question of whether Charlotte should be given artificial ventilation if her condition worsens.

In October, on Charlotte's second birthday, the High Court lifted a court order that ruled doctors need not give Charlotte artificial ventilation in a life-threatening situation.

Doctors still have the right to make a final decision but must now consult with Charlotte's parents and take into account their wishes before making a decision.

Debbie Wyatt said she will move the family to find a bigger council home

Charlotte was allowed home on two medically-supervised visits in December, before being allowed to spend a couple of hours with her family, unsupervised, on Christmas Day.

Until then, she had never left the grounds of St Mary's Hospital.

The Wyatts said occupational health teams have recommended that when Charlotte is ready to leave hospital permanently she must live in a bigger home to accommodate her breathing equipment.

There are limited properties available so we continue to pull out the stops to find them a suitable home Portsmouth City Council spokesman

The family has been on a Portsmouth City Council waiting list to be rehoused into a four or five bedroom home for several months.

Mrs Wyatt, 24, told the BBC News website: "I don't care where we move, we just want Charlotte home."

The Wyatts, who are both originally from the Midlands, have appealed on local radio in Birmingham for private landlords and councils in the area to get in touch if they have a suitable property.

Mr Wyatt, 33, told the BBC News website: "We don't mind where we move.

"If someone came up with a property, we can move straight away and then Charlotte can come home.

Charlotte went home for the first time on 6 December

"I've just been speaking with Charlotte's consultant and we've talked about having her home regularly twice a week for four hours at a time.

"But she's ready to come home except we can't have her because we haven't been rehoused.

"I'm just really, really frustrated."

A spokesman for Portsmouth City Council said: "We are working closely with the Wyatts to find them a new home.

"We are aware they are anxious to be close to St Mary's [Hospital].