Abu Rafi' (may Allah be pleased with him) said that when Sayyiduna Hasan bin Ali (may Allah be pleased with them both) was born, his mother wanted to perform the aqiqah for him with a large ram, so she came to the Prophet (peace and blessings be upon him). He (peace and blessings be upon him) said: "Do not perform the aqiqah; rather, shave the hair of his head and give silver equal to the weight of the hair in charity in the path of Allah or to travellers." When Sayyiduna Husayn (may Allah be pleased with him) was born the following year, Sayyidah Fatimah (may Allah be pleased with her) did the same. If this hadith is authentic, it is as though the Prophet (peace and blessings be upon him) intended to perform their aqiqah himself; therefore he (peace and blessings be upon him) told her to give silver equal to the weight of the hair in charity.
Only Ibn Aqil narrated it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19300