Baby boy critical after Sydney crash

An 11-month-old boy is fighting for life after being critically injured in a car crash in Sydney's southwest.

Police are investigating whether the baby was properly restrained when the BMW he was in collided with a Mercedes-Benz in Lurnea on Monday evening.

The collision triggered the BMW driver's airbag, inflicting critical head and facial injuries on the baby.

He was airlifted to The Children's Hospital at Westmead, where he remains in a critical condition.

Both drivers escaped uninjured.

"Investigators will seek to determine where the child was seated when the airbag was deployed," NSW Police said in a statement on Tuesday.

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