An 18-year-old women has been arrested after she made the unthinkable decision to use her six-month-old son as a weapon to attack her boyfriend on a Florida beach, local police have said.

Tatyana Allen, of Orange County, had travelled around 65 miles from her home to celebrate the Fourth of July on Daytona Beach with her boyfriend and their child.

2 Tatyana Allen was arrested for using her six-month-old son to beat her partner Credit: AP:Associated Press

Shortly before 4.30pm, Allen and her boyfriend had a disagreement which became a physical fight.

Allen then used her baby son to beat her partner, before being swarmed by police responding to emergency calls from concerned passers-by

2 The incident took place on Daytona Beach while the couple was celebrating the Fourth of July Credit: Getty Images

The baby was taken to a hospital Monday afternoon, where he is in good condition, according to Beach Safety Ocean Rescue Captain Tammy Marris

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Allen was taken into custody on charges of battery and infliction of physical and mental injury on a child.

She is being held in Volusia County without bail