1.Muslim, not fasting unbelievers.
2.Mumayyiz meant to think, not fasting madman and children who have not mumayyiz because they do not have willpower. Fasting children who have mumayyiz valid. When he was reached sevenyears, he be asked to fast if he can melaksanakanya. When agereaches 10 years, he should be beaten because of neglect asprayer. (Advice is soft is better).
3.No illness prevented him from fasting, such as in menstruation orchildbirth, fainting, or mad all day.