The incident happened yesterday at Bahavedi village in Shamli district, they said.
Four children Sakib, Wahid, Hasan and Yamah were taken ill soon after eating the flour at the Aaganwadi centre. They were rushed to a government health centre in Shamli after they complained of vomiting where Sakib died, they said.
An inquiry has been ordered into the incident, District Magistrate P K Singh said.