The 51-year-old "Sex and the City" star's son with Matthew Broderick was diagnosed with allergies to peanuts and hazelnuts, also known as anaphylaxis, reported US magazine.
"(She said) his mouth was swelling, he was coughing and his ears were red. She rushed him to the pediatrician," Jessica Parker said.
Bit, who is the spokesperson for the Anaphylaxis: For Reel campaign, said she doesn't live in fear of James, now 13, landing in the hospital.
"He knows how to inform those around him of his food allergies, so that everyone is aware and can help him avoid his allergic triggers," she said.