Analysis of information sources in references of the Wikipedia article "娘娘腔" in Chinese language version.
Other children called them 'sissy.' ...Our boys would have preferred being girls. They liked to dress in girls' or women's clothes. They preferred Barbie dolls to trucks. Their playmates were girls. When they played 'mommy-daddy' games, they were mommy. And they avoided rough-and-tumble play and sports, the usual reasons for the epithet 'sissy.'
Other children called them 'sissy.' ...Our boys would have preferred being girls. They liked to dress in girls' or women's clothes. They preferred Barbie dolls to trucks. Their playmates were girls. When they played 'mommy-daddy' games, they were mommy. And they avoided rough-and-tumble play and sports, the usual reasons for the epithet 'sissy.'