قُلْتُ لِأَبِي عَبْدِ اللَّهِ ع جُعِلْتُ فِدَاكَ الْحُبْلَى رُبَّمَا طَمِثَتْ فَقَالَ نَعَمْ وَ ذَلِكَ أَنَّ الْوَلَدَ فِي بَطْنِ أُمِّهِ غِذَاؤُهُ الدَّمُ فَرُبَّمَا كَثُرَ فَفَضَلَ عَنْهُ فَإِذَا فَضَلَ دَفَعَتْهُ فَإِذَا دَفَعَتْهُ حَرُمَتْ عَلَيْهَا الصَّلَاةُ. - وَ فِي رِوَايَةٍ أُخْرَى إِذَا كَانَ كَذَلِكَ تَأَخَّرَ الْوِلَادَةُ.
“I once asked abu ‘Abd Allah (a.s.), about the case of a pregnant woman, saying, ‘I pray to Allah to keep my soul in service for your cause, can such woman experience Hayd (menses)? He (the Imam) said, ‘Yes, because the child’s food in mother’s womb is blood. It (blood) may exceed the amount of food for the child. It (