The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, narrated to me from Abu Ja'far Muhammad ibn Ali, from Muhammad ibn Al-Hasan, from Ahmad ibn Idris and Muhammad ibn Yahya, from Muhammad ibn Ahmad ibn Yahya, from Muhammad ibn Abd Al-Hamid, from Saif ibn Amirah, from Mansur ibn Hazim. He said several of our companions narrated to me from Abu Abdullah عليه السلام. Imam عليه السلام said: "Seven buckets must be drawn if a child urinates in it, or a mouse or something similar falls into it." Then Imam عليه السلام said: "If an infant who has not yet eaten food urinates in it, one bucket must be drawn."