It is narrated from Sayyiduna Salman bin Amir al-Dabbi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Every newborn is held in pledge for his aqiqah, so shed blood on his behalf and remove the harm from him."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6177