Cao is a yuesao who serves as a live-in postpartum care worker for the mom and the newborn, has been in this industry for 8 years. As a senior yuesao, Cao's salary is more than 10,000 yuan ($1,534) per month now. Last year, she was hired by Mr Chen to take care of his wife and second baby in Chengdu, Southwest China's Sichuan province.

Cao holds Mr Chen's baby in a car after she met with her employer and his wife in a hospital in Chengdu, in December 2015. [Photo/ West China Metropolis Daily]