HANGZHOU - A two-year-old girl who survived last Saturday's deadly train crash but lost her parents in the accident is suffering mental trauma, according to a psychologist.

"Little Yiyi often has nightmares and screams in the night, and often cries. Her emotions are very unstable," said psychologist Zhao Guoqiu after visiting Xiang Weiyi at the No 2 Hospital Attached to the Wenzhou Medical College.

Xiang's behavior is typical of people suffering from post-traumatic stress disorder, Zhao said.