were all born healthy, but as they grew older, they gradually began to develop the same symptoms.”Especially little Guoguo.Several older children don't develop a cough until they are four or five year...: []Yun An felt a pang of sadness well up within her.Zhu Dabao, standing beside her, wanted to say something to comfort Yun An'an, but the words died in his throat. He could only stand silently with her i...