Musannaf Ibn Abi Shaybah 22915 — A man who sells or frees a slave

Ibrahim (may Allah have mercy on him) was asked about a person who sells a pregnant slave woman, or frees her, and makes an exception of the child in her womb. He (may Allah have mercy on him) said: If the child's form has become apparent, the exception is valid; and if its form has not become apparent, the exception is not valid.