The scene of the crash.

The scene of the crash. Photo: Nine News

A four-month-old girl is fighting for her life in hospital after a car slammed into her family's Geelong home.

The baby girl was with her parents in a bedroom when a car ploughed through their fence and into the house about 8.30pm on Sunday.

The baby suffered life-threatening head injuries, an Ambulance Victoria spokesman said. She was initially taken to Geelong Hospital, but was later flown to the Royal Children's Hospital in a critical condition. 

The car crashed into the Breakwater home about 8.30pm on Sunday.

The car crashed into the Breakwater home about 8.30pm on Sunday. Photo: Nine News

Her parents, aged in their 20s, were taken to Geelong Hospital with minor injuries. 

Police said it appeared the male driver failed to negotiate a roundabout at the corner of Fellmongers Road and Boundary Road in Breakwater and crashed into the bedroom.

The 20-year-old driver, from Grovedale, was also taken to Geelong Hospital where he remains under police guard.

Detective Sergeant Andrew Kilpatrick has told Channel Nine it was unclear what caused the driver to lose control at the roundabout.

"The intersection is well lit ... there's nothing we can see here, with road conditions and weather conditions, that would have contributed to the accident," he said.

Detectives from the Major Collision Investigation Unit are investigating the crash.

Anyone with any information is urged to contact Crime Stoppers on 1800 333 000.

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