To sacrifice a lamb and shave-off head for the new born
سَمِعْتُ أَبَا عَبْدِ اللَّهِ ( عليه السلام ) يَقُولُ كُلُّ امْرِئٍ مُرْتَهَنٌ بِعَقِيقَتِهِ وَ الْعَقِيقَةُ أَوْجَبُ مِنَ الْأُضْحِيَّةِ
The narrator heard Abu Abdullah-asws saying: ‘Every person is a pledgee with his Aqeeqa, and the Aqeeqa is more Obligatory than the sacrifice’.[1]
عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ وَ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَمَاعَةَ قَالَ سَأَلْتُهُ عَنْ رَجُلٍ لَمْ يَعُقَّ عَنْ وَلَدِهِ حَتَّى كَبِرَ وَ كَانَ غُلَاماً شَابّاً أَوْ رَجُلًا قَدْ بَلَغَ قَالَ إِذَا ضُحِّيَ عَنْهُ أَوْ ضَحَّى الْوَلَدُ عَنْ نَفْسِهِ فَقَدْ أَجْزَأَتْ عَنْهُ عَقِيقَتُهُ
A number of our companions, from Ahmad Bin Muhammad Bin Khalid and Ali Bin Ibrahim, from his father, from Usman Bin Isa, from Sama’at who said,
‘I asked him-asws about a man who had not performed Aqeeqa for his child until he was old, and was a youthful boy, or a man who had matured. He-asws said: ‘When he offers a sacrifice from him, or the boy offers a sacrifice from himself, so he has sufficed from it of his Aqeeqa’.
وَ قَالَ قَالَ رَسُولُ اللَّهِ ( صلى الله عليه وآله ) الْمَوْلُودُ مُرْتَهَنٌ بِعَقِيقَتِهِ فَكَّهُ أَبَوَاهُ أَوْ تَرَكَاهُ .
‘And he-asws said: ‘Rasool-Allah-saww said; ‘The new-born is a pledgee (mortgaged) with his Aqeeqa, so his parents either free him (from the pledge) or leave him (in it)’’’.[2]
NB: For further details, see for example; https://hubeali.com/welcoming-the-newborn/
[1] Al Kafi – V 6 – The Book of Aqeeqa Ch 14 H 3
[2] Al Kafi – V 6 – The Book of Aqeeqa Ch 26 H 3