Who accepted Islam first among children? 

1. Hazrat Usman (R.A.)
2. Hazrat Umar (R.A.)
3. Hazrat Ali (R.A.)
4. Hazrat Bilal (R.A.)

 Hazrat Ali (R.A.) embraced Islam at age 10, becoming the first child Muslim. As Prophet Muhammad’s ﷺ cousin and ward, he witnessed the first revelation in 610 CE at Cave Hira. Sunni sources (Ibn Ishaq’s Sirat Rasul Allah) and Shia traditions agree on his early conversion, though some debate whether Zaid ibn Harithah preceded him. Ali’s childhood faith is celebrated annually on the 13th of Rajab in many Muslim cultures.