The retrial over the death of three-year-old Alfie Lamb, who was allegedly crushed by a car seat, will take place in September.
Stephen Waterson, 25, twice reversed his chair into his girlfriend's young son on February 1 last year, it is claimed.
Alfie had been placed in the rear footwell of Waterson's Audi convertible on the way back from a shopping trip to Sutton, the Old Bailey had heard.
He collapsed by the time the car reached Croydon and he died in hospital three days later.
Last month, a jury failed to reach a verdict on whether Waterson was guilty of Alfie's manslaughter.
He was found guilty of intimidating a witness, having earlier admitted conspiracy to pervert the course of justice by telling lies to police about what happened.
Alfie's mother Adrian Hoare, 23, was cleared of manslaughter but found guilty of child cruelty and assaulting another witness, Emilie Williams, 19.
Both Hoare, from Gravesend and Williams, of Croydon, had also admitted plotting to pervert the course of justice.
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