Nafi' narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that whenever any of his children asked him for an aqiqah, he would give it to him, and he would perform the aqiqah for his children, male and female alike, with one goat each.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19284