When Zhu Jun graduated from East China Normal University in Shanghai in 2003, he dared not tell anyone he had found a job as a kindergarten teacher.

"People thought a kindergarten teacher was a nanny and they would not accept a university graduate becoming a nanny," he said.

It is now 10 years since Zhu, Shanghai's first male graduate of preschool education studies, started in the profession. In that time he has become the city's first professionally qualified male kindergarten principal.