It is narrated from Bukair, may Allah have mercy on him, that he saw Sayyiduna Abdullah bin Ja'far, may Allah be pleased with them both, kissing Zainab bint Umar bin Abi Salamah while she was about two years old.
It is narrated from Hasan al-Basri (may Allah have mercy on him), he said: If possible, do not look at the hair of any of your household except your wife and young daughters.