ABC7 News was at the scene in San Leandro as police brought the little boy back to her.
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You can see officers hand him over and she gives him a quick hug.
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The mother tells us a carjacker took her son out of the car, left him alone at a warehouse complex and then kept going in the stolen car.
A bystander found the child and called police.
Police say the child was in the backseat of a white Honda Accord that they believe was carjacked at 85th Avenue near G Street in East Oakland.
That's close to the Coliseum complex.
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Investigators haven't said yet whether they have located the car or any possible suspects.