Policeman Guo Zengxi had been detained in central China's Henan Province.
On July 20, a couple went out for a walk after supper holding their seven-month-old daughter in their arms when Guo unexpectedly grabbed the infant, lifted her over his head and hurled her onto the ground, according to media reports.
The Linzhou public security bureau had only handed down a 15-day confinement to Guo, who was likely to have been drunk at the time of the incident, state-run Xinhua news agency reported today.
An investigation team has been set up in response to anger voiced by Chinese netizens at the policeman in Linzhou, Henan, Guo Fajie, head of the public security bureau of Anyang City, which governs Linzhou said.
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"The policeman involved in the baby attack was put under criminal detention on Saturday night and was transferred to a detention center in Anyang City this morning," said Guo Fajie.
Public security and health authorities in Linzhou have sent staff to accompany the baby to Beijing for further medical examination, according to the local government.
In July, a man in Beijing killed a toddler by lifting her from her carriage and throwing her onto the ground during a row with her mother over car parking space.