Union County Prosecutor David Phillips was assigned to take over the case last month, prompting the rescheduling of the trial dates.
Joseph Pilkington has pre-trial hearings scheduled for June 21 and July 11.
Brittany Pilkington allegedly confessed to killing 3-month-old Niall Pilkington in July 2014, 4-year-old Gavin Pilkington in April of last year and 3-month-old Noah in August, authorities said.
Her husband has pleaded not guilty to a charge of sexually assaulting her before they were married when she was a teenager.
Brittany Pilkington, 23, of Bellefontaine, pleaded not guilty to aggravated murder. Her trial is scheduled for October.
Her lawyers have also asked for a special prosecutor to be assigned and for her trial to be moved out to Logan County.