Amrah (may Allah have mercy on her) narrates from Sayyidah Aishah (may Allah be pleased with her), in the hadith of the aqiqah, that in the Jahiliyyah people would soak cotton in the blood of the aqiqah animal and put the blood on the child's head. So the Prophet (peace and blessings be upon him) "ordered that khaluq (a saffron-based perfume) be applied in place of the blood."
Al-Faqih (may Allah have mercy on him) says: In the hadith of Salman bin Amir (may Allah be pleased with him) it says: "Remove the impurity from the child's head." This may mean shaving the head and forbidding that the child's head be touched with blood.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19289