Sayyidah Umm Kurz (may Allah be pleased with her) says that the Messenger of Allah (peace and blessings be upon him) said: "Two equal goats for a boy and one goat for a girl."
Abu Dawud said: This is the (correct) hadith, and the hadith of Sufyan is an error (wahm). Al-Faqih (may Allah have mercy on him) said: Al-Muzani narrated it in al-Mukhtasar from al-Shafi'i, from Sufyan, from Ubaydullah bin Abi Yazid, from Siba' bin Wahb, from Umm Kurz, and al-Muzani erred in it in two places: first, all the other narrators narrated it from Ibn Uyaynah, from Ubaydullah bin Abi Yazid, from his father, from Siba'; and second, they said in it Siba' bin Thabit. Al-Tahawi narrated it from al-Muzani in Kitab al-Sunan correctly in one of the two places, as all the others narrated it from Sufyan. And success is from Allah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19277