It is narrated from Sayyiduna Jabir (may Allah be pleased with them both) that he said: "The Messenger of Allah (peace and blessings be upon him) passed by a woman who was riding in a litter, and her son was with her. She raised her head and said: 'O Messenger of Allah! Is there Hajj for this (child) too?' He (peace and blessings be upon him) said: 'Yes, and you will have a reward (for it).'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated these hadiths from Asad (may Allah have mercy on him) except Khalaf (may Allah have mercy on him), and Ali (may Allah have mercy on him) is alone in narrating them."
Hadith Referenceالمعجم الأوسط / باب الألف / 1257
Hadith Takhrij«أخرجه الترمذي فى «جامعه» برقم: 924، 925، وابن ماجه فى «سننه» برقم: 2910، والبيهقي فى «السنن الكبرى» برقم: 9813، والطبراني فى «الأوسط» برقم: 759»