Mother Ghost (姑获鸟/gu huo niao): According to Strange Tales from Stories of Mountain and Rivers (奇异杂谈之山海经), Mother Ghosts are formed by the grieving thoughts of the women died of childbirth.
The Ming Dynasty "Compendium of Materia Medica" mentioned its origin, said that the dead maternal obsession, holding the baby walking at night, the crying of the baby into the cry of guhuo bird.