Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that a woman held up a child to the Messenger of Allah (peace and blessings be upon him) and said: "Is there Hajj for this one?" He ((peace and blessings be upon him)) said: "Yes, and you will have a reward."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12124