Halliwell had made a complaint to the police Child Protection Unit at a London police station on Aug. 18, personal assistant Antony Read said.
Read said the complaint was about "an incident concerning her daughter Bluebell whilst in the care of a temporary member of staff."
"Bluebell is now happy and well, and there are no further concerns for her welfare," he added.
London's Metropolitan Police confirmed the force was investigating an allegation of physical abuse involving a three-month-old baby. No one has been arrested.
Halliwell -- Ginger Spice of 90s "girl power" group the Spice Girls -- gave birth to Bluebell Madonna, her first child, in May.
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