She reported that she was pregnant with Abdullah bin Zubayr. She said, "I set out while I was at the end of my pregnancy and arrived in Madinah, where I stayed at Quba. I gave birth to him at Quba, then I brought him to the Prophet ﷺ and placed him in his lap. He called for a date, chewed it, then placed it in the child's mouth. The first thing to enter his stomach was the saliva of the Messenger of Allah ﷺ. Then he rubbed his palate with the date, prayed for him, and blessed him. He was the first child born in Islam."
أنها حملت بعبد الله بن الزبير، قالت: فخرجت وأنا متم فأتيت المدينة فنزلت بقباء، فولدته بقباء، ثم أتيت النبي ﷺ فوضعته في حجره، ثم دعا بتمرة فمضغها، ثم تفل في فيه فكان أول شيء دخل في جوفه ريق رسول الله ﷺ، ثم حنكه بتمرة، ثم دعا له وبرك عليه، وكان أول مولود ولد في الإسلام.
Bukhari narrated it in the Merits of the Ansar (3909), and Muslim in the Book of Manners (26:2146), both through the route of Abu Usama, from Hisham bin Urwa, from his father, from Asma, who said, then he mentioned it.Muslim also narrated it (25:2146) through another route from Hisham bin Urwa, Urwa bin Zubayr and Fatimah bint Munzir bin Zubayr told me that they both said, Asma bint Abu Bakr set out when she emigrated, while pregnant with Abdullah bin Zubayr. She reached Quba and gave birth to Abdullah there. Then, once she had given birth, she went to the Messenger of Allah ﷺ so that he could give the newborn the tahnik. The Messenger of Allah ﷺ took him from her and placed him in his lap, then called for a date.Ayesha said, We stayed a while searching for one before we found it. He chewed it, then spat it into the baby's mouth, so the first thing to enter his stomach was the saliva of the Messenger of Allah ﷺ.Asma then said, He wiped him, prayed for him, and named him Abdullah. Later, when he was seven or eight years old, he came to give his pledge of allegiance to the Messenger of Allah ﷺ, Zubayr having instructed him to do so. The Messenger of Allah ﷺ smiled when he saw him approaching, and then accepted his pledge.