From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Chao left her village to get help from Tiger Thief, only to be nearly killed by him and saved by Son Goku. Chao asked Goku to save her village because of his great strength. She brought Goku back to her village and they arrived right when Terror was about to seal a baby named Chenshi inside the Gourd of Mist because he was two weeks old and could not say his name when called.
Disgusted by what they were planning to do to Chenshi, Goku confronted Terror and Plauge only to be absorbed by the Gourd of Mist before he could fight them. He managed to jump out, however, and defeated Terror and Plague, thus saving the village.