A woman was knocked to the ground by her partner, who then gripped her by the chin and repeatedly banged her head on the floor, a court was told.
Blackburn Magistrates' Court heard the entire incident was witnessed by the victim's five-year-old son, who was shouting, "Mummy, Mummy," during the beating.
Andrew Dagg, 37, of Greystones Drive, Fence, pleaded guilty to assault causing actual bodily harm.
He was sentenced to eight months in prison, suspended for 12 months, with 150 hours of unpaid work and 25 days of rehabilitation activity requirements.
He was also made subject to a restraining order for two years, which prohibits any contact with the victim, and ordered to pay her £500 compensation.
Deputy District Judge Matthew Wallace said the offence was made more serious because it had been committed in front of the young child.
Susheela Regala, prosecuting, said Dagg and his partner had been to a function at a nearby social club.
He left early and at 11pm sent her a text message saying: "Home time."
She stayed out until midnight, and on her return, all she could remember was being on the floor with her son standing in front of her and her head being banged on the floor.
"She shouted at her son to run away, but he just stood in the porch shouting 'Mummy, Mummy'," said Miss Regala.
"As soon as she could get up, she grabbed her son, ran to a neighbour's house and called the police."
Gareth Price, mitigating, said his client also had no significant recollection of what happened but had not challenged anything the victim had said.
"He has shown genuine remorse for the impact on the victim and her son," said Mr Price.
Passing sentence, Deputy District Judge Wallace said: "When you bang someone's head on the floor, you don't know what is going to happen.
"At no time did you seek to put blame on the other party, and that is to your credit."
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