A baby was found crawling across a busy four-lane street in the US after his seven-year-old sister took him out of his cot.

The driver who rescued the one-year-old boy returned him to his mother and called police in Brigham City, Utah.

The mother told police she was resting and had put the baby in a cot to sleep. Police say her daughter took the infant out to play and he somehow got out of the back garden.

The baby crawled less than a block when he was found in the lane closest to the pavement.

Police say charges are unlikely, but the case has been referred to the Division of Child and Family Services.

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