Hi Neha if you want to reduce your tummy,You need to combine both healthy diet and exercise on regular basis. Take frequent meals,Drink plenty of water,Include fibers in your diet.Avoid fried,junk and processed foods. Also you can have Luke warm lemon water after every meal will help.Do not keep sitting at a particular place for long time,keep moving after ever 10-15 minutes will help.Also you can try aerobic exercises and crunches which will help to reduce your weight as well as tummy.