The toddler, who was visiting Kentwood, La., with his pop star mom, reportedly had “a reaction to something he ingested” and developed severe hives.

A representative for Spears issued a statement saying Jayden was expected to recover and would most likely be released Tuesday.

The visit by the singer to her hometown marks the first time she has been allowed to travel outside of California with Jayden and brother Sean Preston, 3, since Federline was granted full custody last summer.