Hadith on Children: The Prophet was humble enough to greet children on the street

Anas ibn Malik reported: The Messenger of Allah, peace be upon him, would pass by young boys and greet them with peace.
[Sahih Muslim, Book 26, Number 5391]

عَنْ أَنَسِ بْنِ مَالِكٍ  أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَرَّ عَلَى غِلْمَانٍ فَسَلَّمَ عَلَيْهِمْ

صحيح مسلم كتاب السلام باب استحباب السلام على الصبيان