Hello Harpreet and thanks for the query
Their is nothing in the world except food which results in weight gain and increasing fat. Tummy and bums are the first site where fat first starts to accumulate. So you are in starting phase of getting overweight
. To get rid from it follow some instructions: Reduce your diet, do regular exercise or brisk walk for at-least one hour or join Gym, Avoid fatty, oily and junk food, drink more water, Take as much calories as needed by you according to your height. Stop alcohol and smoking
If you follow these instruction you will surely reduce your weight and finally fat of your tummy.