The former adult star called 911 after one-year-old Journey began vomiting and then passed out at around 11pm local time.
An ambulance raced to the scene and escorted mum and tot to a local medical centre, where Journey was “hydrated”, reports TMZ.
Doctors told Jameson her son was probably suffering from a bout of stomach flu.
It marks the latest in a series of dramas for the the former porn star and her partner Tito Ortiz.
The wrestler was arrested on domestic violence charges on 26 April (10) after reports of a dispute between him and Jameson. The mixed martial arts star then accused his partner of abusing prescription drugs.
Both parties have since withdrawn their complaints and are working towards a reconciliation.