Al-Kāfi - Volume 6 > Special Treatments for the Newborn
Hadith #4

وَ فِي رِوَايَةٍ أُخْرَى حَنِّكُوا أَوْلَادَكُمْ بِمَاءِ الْفُرَاتِ وَ بِتُرْبَةِ قَبْرِ الْحُسَيْنِ ( عليه السلام ) فَإِنْ لَمْ يَكُنْ فَبِمَاءِ السَّمَاءِ .

4. In another Hadith it is said: ‘You should drop water from Euphrates and soil from the grave of al-Husayn, ‘Alayhi al-Salam, or water from the sky in the mouth of your newborn ones.’”