Yu, 12, becomes youngest medallist in Worlds history

Yu Zidi started swimming at the age of six

Chinese schoolgirl Yu Zidi became the youngest swimmer in history to win a medal at the World Aquatics Championships as China claimed bronze in the relay.

The 12-year-old, who missed Thursdays final, swam in the heats of the womens 4x200m freestyle relay earlier this week and therefore qualified for a medal.

China finished third in the final in Singapore, behind the United States and winners Australia.

She is the youngest medallist at a major international competition since Denmarks Inge Sorensen won a bronze medal in the 200m breaststroke at the 1936 Olympics, less than a month after her 12th birthday.

"It feels quite emotional, its a nice feeling," Yu said.

The schoolgirl, who turns 13 in October, came close to earning individual glory in the womens 200m butterfly final on Thursday, but narrowly missed out on a medal in fourth place.

In Mondays individual medley final, Yu missed out on a medal by 0.06 seconds with another fourth-placed finish.

In May, Yu set a world record for a 12-year-old in the 200m individual medley with a time of 2:10.63, leading World Aquatics to label her a "sensation" on social media.

Yus participation at the World Championships has divided opinion.

Competitors in the championships must be at least 14 years of age but Yu was permitted entry because her times met the associations A standard.

But, while Yus ability is not in question, not everyone is convinced she should be allowed to compete on the global stage yet.

The topic was discussed on BBC Radio 5 Live with four-time world champion swimmer Karen Pickering and Olympic bronze medallist Steve Parry offering differing opinions.

"To see a youngster go in the events she is doing is on the one hand astonishing, but it does slightly raise the question of how long has she been training hard?" said Pickering.

"What kind of training is she doing? What is that doing to her physically?

"I worry about what its doing physically to a child doing that amount of training at that age. Weve seen it with gymnasts that are pushed too young and the impact it has on their body long-term."

Parry, though, said Yus participation was "positive" and had echoes of Sharron Davies, who represented Great Britain at the 1976 Olympics at the age of 13.

"Its a young girl who is 12 years of age and its right we are asking questions, but I got spanked by a 15-year-old Michael Phelps in Sydney and he went on to be the greatest swimmer weve ever seen," said Parry.

"You can have youngsters, whether it be Sharron Davies, Yu or Katie Ledecky, but we have got to take care of their mental health and make sure they arent being pushed too much physically.

"These young proteges should be celebrated."