The Messenger of Allah ﷺ was asked what number of witnesses is acceptable concerning breastfeeding. He replied, "One man and one woman."
قال أبو عبد الرحمن و حدثنا أبو بكر عبد الله بن أبي شيبة قال حدثنا معتمر عن محمد بن عثيم عن محمد بن عبد الرحمن بن البيلماني عن أبيه
سئل رسول الله ﷺ ما يجوز في الرضاعة من الشهود قال رجل وامرأة
Its isnad is daif, and it is a repetition of what came before it with its own isnad, but this is one of the additions of Abdullah bin Ahmad. He and his father Imam Ahmad both narrated it from Abdullah bin Muhammad bin Abu Shayba.There is a difference in wording between Abdullah bin Ahmad's narration and his father's narration, for in this one it says "a man and a woman," joined by "and," and that is why Abdullah repeated it, to distinguish between the two wordings. Haythami noted this narration in Majma al-Zawaid, saying, "And in one narration, a man and a woman."