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Grandmother Kris Jenner tells TV's Good Day L.A., "Mason had a little allergic reaction over the weekend, on Friday night, to peanut butter."

The tot has since returned home and his aunt, Kim Kardashian, insists the boy is "totally fine".

She adds, "Kourtney... as a new mum, she takes extra precautions, so she called 911 and an ambulance came, but they're totally fine."