This hadith is strange (gharīb) from this chain of transmission.

The practice followed by the people of knowledge among the Companions of the Prophet, peace and blessings be upon him, and others, is that a man should say when slaughtering: "In the name of Allah, and Allah is the Greatest" (Bismillah, wallahu akbar). This is the opinion of Ibn al-Mubarak.

Regarding al-Muṭṭalib ibn ʿAbdillah ibn Ḥanṭab, it is said that he did not hear (hadith) from Jābir.

Chapter 20

1600 – ʿAlī ibn Ḥujr narrated to us, he said: ʿAlī ibn Mushir informed us, from Ismāʿīl ibn Muslim, from al-Ḥasan, from Samura, who said: The Messenger of Allah, peace and blessings be upon him, said: "A boy is held in pledge for his ʿaqīqah; it is slaughtered on his behalf on the seventh day, he is named, and his head is shaved."

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And Allah knows best.

It was also recorded by Aḥmad (14837), Abū Dāwūd (2810), al-Ṭaḥāwī in "Sharḥ Maʿānī al-Āthār" 4/177-178, and al-Ḥākim 4/229 via the chain of al-Muṭṭalib ibn ʿAbdillah, from Jābir.

It was also recorded with similar wording by Aḥmad (15022), Abū Dāwūd (2795), and Ibn Mājah (3121) via the chain of Abū ʿAyyāsh ibn al-Nuʿmān al-Maʿāfirī al-Baṣrī, from Jābir ibn ʿAbdillah, and it was authenticated by Ibn Khuzaymah (2899) and others.

It is supported by the hadith of Abū Saʿīd al-Khudrī recorded by Aḥmad (11051), which is authentic; see the rest of its supporting witnesses there.

(1) An authentic hadith, also recorded by Abū Dāwūd (2837) and (2838), Ibn Mājah (3165), and al-Nasāʾī 7/166, and it is in the "Musnad" of Aḥmad (20083).

See also what has preceded from the author at number 180.