Asma bint Abu Bakr reported,

She was pregnant with Abdullah bin Zubayr in Mecca. She said, "I left while in the final stage of pregnancy and arrived in Medina, where I stayed at Quba. I gave birth there, then brought him to the Messenger of Allah ﷺ. I placed him in his lap, and he called for a date, chewed it, and then placed it in the baby's mouth. So the first thing to enter his stomach was the saliva of the Messenger of Allah ﷺ. Then he rubbed the chewed date on the baby's palate, prayed for him, and blessed him."He was the first child born in Islam, so they rejoiced greatly at his birth, because it had been said to them that the Jews had bewitched them so that no children would be born to them.

Bukhari 5469

Sahih

حدثنا إسحاق بن نصر حدثنا أبو أسامة حدثنا هشام بن عروة عن أبيه

عن أسماء بنت أبي بكر رضي الله عنهما

أنها حملت بعبد الله بن الزبير بمكة قالت فخرجت وأنا متم فأتيت المدينة فنزلت قباء فولدت بقباء ثم أتيت به رسول الله ﷺ فوضعته في حجره ثم دعا بتمرة فمضغها ثم تفل في فيه فكان أول شيء دخل جوفه ريق رسول الله ﷺ ثم حنكه بالتمرة ثم دعا له فبرك عليه وكان أول مولود ولد في الإسلام ففرحوا به فرحا شديدا لأنهم قيل لهم إن اليهود قد سحرتكم فلا يولد لكم

البخاري 5469صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Aqiqah
Chapter
Naming the newborn on the morning of his birth for one who has not offered aqiqah for him, and performing tahnik for him
Numbering
Darussalam 5469
Bukhari 5469