A Perth policeman has saved a choking baby just before the clock ticked over to Christmas Day.

Just after 11.30pm last night a distraught mother and father rushed into the Northbridge Police Station calling out for help.

Their eight-month-old baby had been choking on some food and wasn't breathing.

A Perth policeman has rushed to the aid of a choking baby and removed food from its throat in a move that saved a family's Christmas. (Supplied)

Acting Sergeant Jason Lee quickly responded, rushing over and taking the child from her dad's arm before performing first aid.

"Our officers receive first aid training and with several years of experience, it looks like that training experience just kicked in and he's gone straight into action," Acting Inspector Shane Crook told 9News about his fellow officer.

In a matter of seconds Acting Sergeant Lee had dislodged the food and had the baby breathing freely again.

Acting Sergeant Jason Lee quickly began first aid on the choking baby in front of two distraught parents on Christmas Eve. (Supplied)

"He just ran in (and) assessed it, it was what it was, the baby straight under his arm a pat on the back and the food stuff came out" Act. Insp. Crook said.

"It just sort of lifts the place. a situation like that. It is positive, it's a good result, I think everyone would have been all-smiles... police officers like good stories."

In a matter of seconds Acting Sergeant Lee had dislodged the food and had the baby breathing freely again. (Supplied)

While the family was lucky there was a 24-hour manned station nearby, police are urging anyone in a similar situation to call triple zero.