Ja'far bin Muhammad narrates from his father, from his grandfather, that Sayyidah Fatimah (may Allah be pleased with her) slaughtered a goat at the birth of Hasan and Husayn (may Allah be pleased with them both), then removed their hair and gave in charity silver equal to its weight.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19297