Generally speaking, children’s literature is about secrets of childhood , and from the microcosmic view, Secrets of childhood are actively integrated with narration of children’s literature ,which form a complex about narration of childrenhood’s secret within writers of children’s literature.

The idioms "k(o)¨ldür-iyen dürüjü k(o)¨ ücilen asaraju" and "kül-düriyen kebte üljükü ücilen((o)¨sgebe)",which appear in section 214 and section 203 in Secret History separately,are the idiomatic sentence patterns embodying foster children originating from primitive society mimicking birth ceremony.

In Section 201 of Mongolian Secret History, When Zhamuha was on his deathbed, he spoke out words from the depths of his heart in the face of Andatiemuzhen, including his own deadly weaknes among which there was a Mongolian sentence, whose Chinese transliteration is “Eme Mi Ne Dou Mo Hei Chi”.