Jayden's "fine"

Jayden James is doing fine after being admitted to the hospital overnight from an allergic reaction.

"He's doing fine," the source tells PEOPLE. "They kept him overnight."

Jayden was taken to the hospital after suffering "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.

As for what caused the reaction, "They're just not sure," said the
source.

He's currently saying his prayers and just waiting until he can get back to the other Nanny, the one who knows his allergies.

Jokes, it happens to the best of mothers.

source