Did the Prophet (peace be upon him) smell his son Ibrahim after his death, and is there any Sunnah to that effect?

The Prophet's sniffing of his son Ibrahim was not after his death, but during his lifetime. He took him, kissed him, and sniffed him. However, kissing the deceased after death is permissible, as it is authentically reported that Abu Bakr al-Siddiq, may Allah be pleased with him, uncovered the face of the Prophet, may Allah's peace and blessings be upon him, after his death and kissed him.