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Horrifying footage shows a young boy's final moments after his swimming ring flipped upside down while there were no adults around.
The distressing clip was recorded on CCTV, and sparks fresh safety fears about using swimming rings while children are unsupervised.
The two-year-old's mum left him unattended for six minutes while she went to the toilet.
The tragedy happened at a baby accessories shop - owned by the tot's mother - in Xuzhou District, which is in the city of Yibin in south-western China.
Mum Ms Zhao, left her son unattended for six minutes, a statement by local police said.