The man arrested on suspicion of dangerous driving and bailed pending further investigation is from Solihull, Staffordshire Police said.
Police are appealing for witnesses to the crash.
A detailed investigation of the scene was done by police and the vehicles involved will be thoroughly examined later as the investigation carries on, a police spokesman said.
He also said that specially trained family liaison officers are supporting the baby's next of kin.
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Mohammed Ashraf suffered an allergic reaction after being served the meal at his school.
Derbyshire Constabulary has referred itself to the Independent Police Complaints Commission.
Cloudy and dry tonight. Brighter tomorrow.