Mae'r gyfrol hon yn archwilio natur y cynfod sensitif hwn ym mywyd person ifanc, trwy gyfrwng straeon craff a dididorol Ceir yma straeon gwreiddiol gan yr awduron Eoin Colfer, Bali Rai, Marcus Sedgewick, Kevin Brooks, Margaret Mahy, Mary Hooper, Helen Oyayemi, Eleanor Updale, Jean Ure a John McLay Addasiad Cymraeg o'r gyfrol Thirteen gyhoeddwyd gan Orchard Books [This anthology explores the adventures and difficulties, the challenges and fun, of being thirteen years old Includes original stories by authors Eoin Colfer, Bali Rai, Marcus Sedgewick, Kevin Brooks, Margaret Mahy, Mary Hooper, Helen Oyayemi, Eleanor Updale, Jean Ure and John McLay A Welsh adaptation of Thirteen]