Charlie Bothuell V was missing for 11 days last June before authorities found him in the basement during a highly publicized search. His father, Charlie Bothuell IV, and stepmother, Monique Dillard-Bothuell, are charged with child abuse and torture.
A doctor is expected to return to the witness chair when the hearing resumes on Tuesday afternoon.
The Bothuells deny the allegations and insist they didn't know the boy was in the basement. Defense lawyers claim the 13-year-old is lying.
Judge Shannon Holmes must decide whether there's probable cause to send the case to trial.