"No suckling is to be carried on after the baby is two years old."

Sahih al-Bukhari · Book 67 · Hadith 5102

حَدَّثَنَا أَبُو الْوَلِيدِ، حَدَّثَنَا شُعْبَةُ، عَنِ الأَشْعَثِ، عَنْ أَبِيهِ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم دَخَلَ عَلَيْهَا وَعِنْدَهَا رَجُلٌ، فَكَأَنَّهُ تَغَيَّرَ وَجْهُهُ، كَأَنَّهُ كَرِهَ ذَلِكَ فَقَالَتْ إِنَّهُ أَخِي‏.‏ فَقَالَ ‏"‏ انْظُرْنَ مَا إِخْوَانُكُنَّ، فَإِنَّمَا الرَّضَاعَةُ مِنَ الْ…

Narrated `Aisha: that the Prophet (ﷺ) entered upon her while a man was sitting with her. Signs of answer seemed to appear on his face as if he disliked that. She said, "Here is my (foster) brother." He said, "Be sure as…