Al-Adab Al-Mufrad #367
Children
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا أَصْبَغُ قَالَ: أَخْبَرَنِي ابْنُ وَهْبٍ قَالَ: أَخْبَرَنِي مَخْرَمَةُ بْنُ بُكَيْرٍ، عَنْ أَبِيهِ، أَنَّهُ رَأَى عَبْدَ اللهِ بْنَ جَعْفَرٍ يُقَبِّلُ زَيْنَبَ بِنْتَ عُمَرَ بْنِ أَبِي سَلَمَةَ، وَهِيَ ابْنَةُ سَنَتَيْنِ أَوْ نَحْوَهُ.
Bukayr reported that he saw 'Abdullah ibn Ja'far kissing Zaynab,
the daughter of 'Umar ibn Abi Salama when she was about two years old.
About Al-Adab Al-Mufrad
This hadith is #367 from Al-Adab Al-Mufrad, in the Book of Children.