Mothers gathered with their babies at the Imam Reza Shrine in Mashhad on Friday

Mothers gathered with their babies at the Imam Reza Shrine in Mashhad on Friday,

marking the annual ‘Hosseini Infants’ ceremony

Held across Iran on the first Friday of Muharram, it honors Ali Asghar

The 6-month-old son of Imam Hussein,

killed at the Battle of Karbala