Is the report narrated in Musnad Ibn Razin—that the Prophet, may Allah bless him and grant him peace, recited Surat Al-Ikhlas into the ear of a newborn—considered authentic by the Hadith scholars, and what is the opinion of the verifiers regarding it?

The narration regarding the Adhan and Iqamah in the ear of a newborn has only been attributed to the aforementioned Musnad, and the absence of this narration from all reliable Hadith collections (Sahih, Sunan, and Musnad) - except for Musnad Ibn Razin - is sufficient to deem it weak. As for the Adhan in the ear of a newborn, that is authentic.