The Prophet ﷺ said: A boy is in pledge for his Aqiqah. Sacrifice is made for him on the seventh day, his head is shaved and is smeared with blood. When Qatadah was asked about smearing with blood, how that should be done, he said: When you cut the head (i.e. throat) of the animal (meant for Aqiqah), you may take a few hair of it, place them on its veins, and then place them in the middle of the head of the infant, so that the blood flows on the hair (of the infant) like a threat. Then its head may be washed and shaved off. Abu Dawud said: In narrating the word "is smeared with blood" (yudamma) there is a misunderstanding on the part of Hammam. Abu Dawud said: Hammam has been opposed in narrating the words "is smeared with blood". This is misunderstanding of Hammam. They narrated he word "he is given a name (yusamma) and Hammam narrated it "is smeared with blood" (yudamma). Abu Dawud said: This tradition is not followed.  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ كُلُّ غُلاَمٍ رَهِينَةٌ بِعَقِيقَتِهِ تُذْبَحُ عَنْهُ يَوْمَ السَّابِعِ وَيُحْلَقُ رَأْسُهُ وَيُدَمَّى فَكَانَ قَتَادَةُ إِذَا سُئِلَ عَنِ الدَّمِ كَيْفَ يُصْنَعُ بِهِ قَالَ إِذَا ذَبَحْتَ الْعَقِيقَةَ أَخَذْتَ مِنْهَا صُوفَةً وَاسْتَقْبَلْتَ بِهِ أَوْدَاجَهَا ثُمَّ تُوضَعُ عَلَى يَافُوخِ الصَّبِيِّ حَتَّى يَسِيلَ عَلَى رَأْسِهِ مِثْلُ الْخَيْطِ ثُمَّ يُغْسَلُ رَأْسُهُ بَعْدُ وَيُحْلَقُ  

[Machine] About the Prophet ﷺ , he said: "Every newborn is pledged with its sacrificial animal. It is slaughtered on its seventh day, and it is shaved and named." Qatadah used to describe the blood and say: "When the sacrificial animal is slaughtered, a wool is taken and the edges of the animal are wiped with it. Then, it is placed on the forehead of the baby until the blood flows resembling a thin string. After that, the baby's head is washed, and then it is shaved." Affan said: Aban informed us with this hadith and said: Abdullah said, "And I do not consider it obligatory."  

عَنِ النَّبِيِّ ﷺ قَالَ «كُلُّ غُلَامٍ رَهِينَةٌ بِعَقِيقَتِهِ يُذْبَحُ عَنْهُ يَوْمَ سَابِعِهِ وَيُحْلَقُ وَيُدَمَّى» وَكَانَ قَتَادَةُ يَصِفُ الدَّمَ فَيَقُولُ «إِذَا ذُبِحَتِ الْعَقِيقَةُ تُؤْخَذُ صُوفَةٌ فَيُسْتَقْبَلُ بِهَا أَوْدَاجُ الذَّبِيحَةِ ثُمَّ تُوضَعُ عَلَى يَافُوخِ الصَّبِيِّ حَتَّى إِذَا سَالَ شَبَهُ الْخَيْطِ غُسِلَ رَأْسُهُ ثُمَّ حُلِقَ بَعْدُ» قَالَ عَفَّانُ حَدَّثَنَا أَبَانُ بِهَذَا الْحَدِيثِ قَالَ وَيُسَمَّى قَالَ عَبْد اللَّهِ «وَلَا أُرَاهُ وَاجِبًا»