Busey's rep would only say it was a "childhood illness" and that Luke is expected to return home with Busey, 77, and his fiancé, Steffanie Sampson, 40, by the end of this week.
"Luke Busey, one-year-old son of Steffanie Sampson and Gary Busey, is being treated for a childhood illness at Cedars Sinai and is expected to be going home by the end of the week," the rep said in a statement to Access Hollywood.
The actor and his girlfriend were excited at the birth of their first child together last year. "This feels like a dream," they said in a statement. "We feel so blessed and are overwhelmed with happiness at Luke's arrival."
Busey also has two children from previous relationships, including 38-year-old Jake Busey and 17-year-old Alectra.
"Gary is very grateful to his fans for their love and support," his rep says. "Steffanie and Gary thank everyone for their get well prayers for Luke."
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