Britney Spears's son reported better

Britney Spears' youngest son Jayden is reportedly doing better.

A source who is allegedly close to the family tells People magazine: "He's doing fine, they kept him overnight."

Jayden was taken to the hospital after he had "a terrible allergic reaction. He had hives, was itchy and irritable," according to the source, who says that Britney Spears and her mother, Lynne, spent the night at the hospital with Jayden.

No one is sure why he had the reaction, according to People.

Spears posted this statement on her Web site: "Jayden James Federline was admitted to the Southwest Mississippi Regional Medical Center on Sunday, November 9th. Doctors concluded he had a reaction to something he ingested. He is expected to be discharged tomorrow."