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Kourtney Kardashian was wheeled out of her Calabasas home clutching baby Mason in her arms on Friday evening after her 11-month-old son started breathing irregularly.

A neighbor tells X17online: "The ambulance arrived around 7 pm Friday night and Kourtney was in a wheelchair being pushed by one of the EMT's. She was holding Mason but it was hard to tell who the patient was. They both appeared to be okay and no one was panicking."

A source close to the family tells us Mason suffered an allergic reaction believed to have come from something he ate for dinner: "It was nothing major; Kourtney and Scott just wanted to have him checked out but he was fine."

The couple was seen here (above photo and gallery) out with Mason earlier on Friday after lunch at the nearby mall.