Shaum/Sawm is one of The Five Pillars of Islam. Ramadan (a complete fasting), we do the fast for about 29 or 30 days in a row. It is the Holy Month for Muslims. Those twelve years old and above must complete their fast from dawn to sunset. I've started to teach my child to fast from the last two years when he was 6 years old, even he's just done his first fast for only a couple hours, at least he tried. There are many even as young as four or five are encouraged to fast for a few hours a day during Ramadan by their parents. It's to begin appreciating the significance of the Holy month of Ramadan. Alhamdulillah , I'm very grateful, this Ramadan my son now is 8 years old and so excited about following Ramadan completely.