Sa'id bin Abi Arubah (may Allah have mercy on him) narrates from Qatadah (may Allah have mercy on him) that on the seventh day the child's head is to be shaved and he is to be given a name.
Abu Dawud said: The word 'yudamma' (he is smeared with blood) is an error from Hammam; 'yusamma' (he is given a name) is more correct. Sallam bin Abi Muti' narrated it thus from Qatadah, and so did Iyas bin Daghfal and Ash'ath from al-Hasan.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19291