'All I ever want is justice for my child - what have I done wrong?' asked Jiang Yalin , 35, whose three-year-old daughter suffers from kidney problems from drinking melamine-tainted milk powder since birth.
Doctors found several stones in her daughter's kidneys, and the toddler's face often puffs up from the fluid build-up in her body.
Jiang and other parents seeking medical treatment and compensation have travelled to Beijing several times to petition the central government, becoming targets of police surveillance every time.
And when police in their community found out about their plans, they were taken into police custody to stop them from going to Beijing.
'Even when I went to Guizhou to see my parents, the local agents followed me,' Jiang said. 'But I'm not doing anything illegal!'
Jiang's daughter was one of nearly 300,000 children who fell ill from drinking milk tainted with melamine, a toxic industrial chemical.