Hazrat Sha'bi (may Allah have mercy on him) says: Yazid bin Abi Muslim asked me about a pregnant widow, so I said: All the wealth will be spent on her until the child is born. Then Yazid said: We will distribute the inheritance and allocate the share of a boy for the child in her womb; if it is a boy, we will give him his share, if it is a girl, we will give her share, and the rest of the inheritance will be distributed. I said: What if twins are born? Because my sister Amrah (may Allah have mercy on both of us) and I were born from the same womb.
Hadith Referenceسنن سعید بن منصور / كتاب الطلاق / 2553
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 1376، 1382، وابن أبى شيبة فى «مصنفه» برقم: 19323، 19520»