He is most likely suffering from type 1 diabetes mellitus which is a less common form of diabetes and is detected in childhood. In this condition, the body cannot produce a hormone called insulin which is required to keep blood sugar levels within normal. Because of the deficiency, he needs to be given insulin externally in the form of injections. This treatment is lifelong and an attempt to stop the injections can be dangerous. A visit to a diabetologist will help to know more about this condition and the precautions to be followed for a healthy life. With proper precautions and doses, he will be able to live a life like any other child.