Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:1451d – Abū Bakr b. Abū Shaybah And ʾIsḥāq b. Ibrāhīm > ʿAbdah b. Sulaymān > Ibn Abū ʿArūbah Bihadhā al-Isnād Ammā Isḥāq > Kariwāyah Ibn Bishr or al-Raḍʿatān or al-Maṣṣatān Waʾammā Ibn Abū Shaybah

In the narration transmitted on the authority of Ibn Bishr there is a mention of two sucklings and Ibn Abu Shaiba has narrated it with a small variation of wording.  

مسلم:١٤٥١d – وَحَدَّثَنَاهُ أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ جَمِيعًا عَنْ عَبْدَةَ بْنِ سُلَيْمَانَ عَنِ ابْنِ أَبِي عَرُوبَةَ بِهَذَا الإِسْنَادِ أَمَّا إِسْحَاقُ فَقَالَ كَرِوَايَةِ ابْنِ بِشْرٍ أَوِ الرَّضْعَتَانِ أَوِ الْمَصَّتَانِ وَأَمَّا ابْنُ أَبِي شَيْبَةَ فَقَالَ

وَالرَّضْعَتَانِ وَالْمَصَّتَانِ