Yahya related to me from Malik from Yazid ibn Abdullah ibn Qusayt al-Laythi that Said ibn al- Musayyab said, "The slaughter of what is in the womb is included in the slaughter of the mother if it is perfectly formed and its hair has begun to grow."  

أَنَّهُ كَانَ يَقُولُ ذَكَاةُ مَا فِي بَطْنِ الذَّبِيحَةِ فِي ذَكَاةِ أُمِّهِ إِذَا كَانَ قَدْ تَمَّ خَلْقُهُ وَنَبَتَ شَعَرُهُ  

[Machine] Ibn Umar used to say, "When the camel is slaughtered, the owner has the right to take all the contents of its abdomen as part of his share if its creation is complete and its hair has grown. When it comes out of its abdomen alive, it is slaughtered until the blood comes out of its cavity." This is the wording of the hadith of Ibn Bukayr, and in the narration of Ibn Wahb, it includes both its contents and the remainder. This is the correct position.  

اللهِ بْنَ عُمَرَ ؓ كَانَ يَقُولُ إِذَا نُحِرَتِ النَّاقَةُ فَذَكَاةُ مَا فِي بَطْنِهَا فِي ذَكَاتِهَا إِذَا كَانَ قَدْ تَمَّ خَلْقُهُ وَنَبَتَ شَعْرُهُ وَإِذَا خَرَجَ مِنْ بَطْنِهَا حَيًّا ذُبِحَ حَتَّى يَخْرُجَ الدَّمُ مِنْ جَوْفِهِ لَفْظُ حَدِيثِ ابْنِ بُكَيْرٍ وَفِي رِوَايَةِ ابْنِ وَهْبٍ بِذَكَاتِهَا وَالْبَاقِي سَوَاءٌ هَذَا هُوَ الصَّحِيحُ مَوْقُوفٌ