(72) باب صِحَّةِ حَجِّ الصَّبِيِّ وَأَجْرِ مَنْ حَجَّ بِهِ
Ibn Abbas (Allah be pleased with them) reported:
A woman lifted up her child and said: Messenger of Allah, would the child be credited with having performed the Hajj? Thereupon he said: Yes, and there would be a reward for you.
Reference: Sahih Muslim 1336 b
In-book reference: Book 15, Hadith 458
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 3092