A woman who had no idea she was 37 weeks pregnant gave birth during a flight from Canada to Japan.

Ada Guan, 23, was 35,000 feet above the Pacific Ocean en route to a holiday in Japan with her boyfriend Wes Branch when she suddenly went into labour, the Calgary Sun reported.

“She told Wesley ‘something fell out of me’ and all of a sudden there was a baby,” Mr Branch’s mother Sandra told the paper.

Luckily, a doctor was also onboard the flight from Calgary to Narita and was able to help Ms Guan.

She gave birth to a healthy girl called Chloe.

Safari

“I couldn’t imagine. This happened completely unexpectedly. It turned out to be a beautiful baby girl,” Mr Branch told reporters.

Ms Guan, who is of a slight build, noticed she had gained a small amount of weight but got a negative result on a pregnancy test and visited a doctor before her trip, who did not spot her condition, the Calgary Sun reported.

“I saw her just two weeks ago and she doesn’t look at all pregnant, she’s just tiny little thing,” Mr Branch’s mother told the paper.

Mother and baby spent Sunday night – Mother’s Day in Canada – in hospital and the family is expected to return to Canada next week.