Sahih al-Bukhari #3910 · Merits of the Helpers in Madinah (Ansaar)

Sahih al-BukhariAisha
Sahih al-Bukhari · Book 63 · Merits of the Helpers in Madinah (Ansaar)
Sahih al-Bukhari · كتاب 63 · كتاب مناقب الأنصار
The first child who was born in the Islamic Land (i.e. Medina) amongst the Emigrants, was 'Abdullah bin Az-Zubair. They brought him to the Prophet. The Prophet (ﷺ) took a date, and after chewing it, put its juice in his mouth. So the first thing that went into the child's stomach, was the saliva of the Prophet
حَدَّثَنَا قُتَيْبَةُ، عَنْ أَبِي أُسَامَةَ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله
عنها ـ قَالَتْ أَوَّلُ مَوْلُودٍ وُلِدَ فِي الإِسْلاَمِ عَبْدُ اللَّهِ بْنُ الزُّبَيْرِ، أَتَوْا بِهِ النَّبِيَّ صلى الله عليه وسلم فَأَخَذَ النَّبِيُّ صلى الله عليه وسلم تَمْرَةً فَلاَكَهَا ثُمَّ أَدْخَلَهَا فِي فِيهِ، فَأَوَّلُ مَا دَخَلَ بَطْنَهُ رِيقُ النَّبِيِّ صلى الله عليه وسلم‏.‏
Reference : Sahih al-Bukhari 3910In-book reference : Book 63, Hadith 135