وَمَنْ وَلَدَتْ وَلَدَيْنِ فِي بَطْنٍ وَاحِدٍ: فَنِفَاسُهَا مَا خَرَجَ مِنَ الدَّمِ عَقِبَ الْوَلَدِ الْأَوَّلِ عِنْدَ أَبِي حَنِيفَةَ وَأَبِي يُوسُفَ رَحِمَهُمَا اللَّهُ.
Meaning: For a woman delivering twins from one pregnancy, Abu Hanifah and Abu Yusuf count nifas from bleeding following the first child.
The disagreement concerns when nifas begins. Postnatal bleeding may appear after the first of two twins; these two jurists begin counting from that occurrence.