It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he or another man asked the Prophet (peace and blessings be upon him) about how many witnesses are sufficient to establish proof of breastfeeding. The Prophet (peace and blessings be upon him) said: "One man and one woman."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4910
Hadith Gradingحکم دارالسلام:إسناده ضعيف جدا لضعف الشيخ من أهل نجران، وهو محمد ابن عثيم.