Mukhtasar Bukhari

Umm al-Mu'mineen Aisha Siddiqa (may Allah be pleased with her) said that a Bedouin came to the Prophet Muhammad (peace be upon him) and said, "You kiss children, but we do not kiss them." The Prophet (peace be upon him) replied, "What can I do if Allah has not placed mercy in your heart (so how can I put it there now)?"

Narrated from Amir al-Mu’minin Umar bin Khattab (may Allah be pleased with him) that some captives were brought before the Messenger of Allah (peace and blessings of Allah be upon him), among them was a woman whose breasts were full of milk, dripping, and whenever she found a child among the captives, she would take him to her belly and nurse him. The Prophet (peace and blessings of Allah be upon him) said to us: “Do you think this woman would throw her child into the fire?” We said: Never, as long as she is able, she would not throw her child into the fire. So the Prophet (peace and blessings of Allah be upon him) said: “Allah is more merciful to His servants than this woman is to her child.”