أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مُحَمَّدِ بْنِ عُقْبَةَ، عَنْ كُرَيْبٍ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ امْرَأَةً، رَفَعَتْ صَبِيًّا لَهَا إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَتْ يَا رَسُولَ اللَّهِ أَلِهَذَا حَجٌّ قَالَ ‏"‏ نَعَمْ وَلَكِ أَجْرٌ ‏"‏ ‏.‏

It was narrated from Ibn 'Abbas that

the Messenger of Allah passed by a woman when she was in her seclusion and had a child with her. She said: "Is there Hajj for this one?'' He said: "Yes, and you will be rewarded.''(sahih)