A father of a two-year-old girl says he was "absolutely disgusted" to find his child chewing on a used condom she picked up in a McDonald's playground.



A spokeswoman for McDonald's said the company is investigating the incident at the fast-food chain's Geraldton restaurant in Western Australia's mid-west.



The father was eating lunch at the restaurant on Saturday when his infant daughter came out of the playground with a used condom in her mouth.



"I was absolutely disgusted. Other people grabbed their kids and just about jumped the fence," the father told The West Australian newspaper.



The man said he washed the girl's hands and mouth with soap and would continue to monitor her health.



He said that when he showed the condom to a junior manager at the McDonald's restaurant, he was informed it was the second one found in the playground that day.



A McDonald's spokeswoman said the company was treating the matter "very seriously".



Cleanliness and safety were the company's top priorities, with the shift manager required to make half-hourly duty checks on all areas of the restaurant, including the dining room, rest rooms and playground, she said.