Childhood obesity has reached to its epidemic level in most of the developed as well as developing countries. The childhood obesity and overweight have significant negative impact on both physiological and physical health. Obesity and overweight in children can cause of non-communicable diseases such as cardiovascular disease and diabetes.The mechanism of childhood obesity is still not fully cleared yet and it believed that multiple causes can be possible such as lifestyle, environmental factor and eating habits. Overall, obesity and overweight depends on the fat and caloric intake. Apart from this, sugar consumption though soft drinks slowly decline the physical activity resulting in weight gain and obesity. This review article will discuss about the childhood obesity causes, related risk factors and preventive measures that can take to reduce the childhood obesity problem. In order to reduce the chances of obesity and overweight in such an early age, healthy lifestyle and physical activities needs to be promoted in schools as well as at home.