Musannaf Ibn Abi Shaybah

Hazrat Jabir narrates that Hazrat Amir said: At the very foundation of every pregnancy, there is a "ghurra," that is, a male or female slave. And Hazrat Hakam said: In the beginning of the pregnancy, there will be reconciliation until the creation of the child becomes apparent. Hazrat Waki' said: The statement of Hazrat Hakam is more preferable than the statement of Imam Sha'bi.