Hi Jyothsna, welcome to HCM.
This condition prevails among most of the new mothers and it can be really worrying. You will have to follow a good diet along with some exercise everyday to lose the belly fat. With regards to exercise, you need to do stomach crunches, yoga
if possible or bending exercises everyday at least for 30 minutes. This needs a lot of determination and consistency to lose the belly fat. With regards to diet, include faat burning foods such a honey, fruits and vegetables, hot water etc which will help in melting the fat. Replace sugar with honey. Snack on fruits and vegetables when you feel hungry. Avoid junk, fatty and fried foods. Consume very milk steamed foods if possible. Also cut down on rice and replace it with wheat rotis, dhalia etc. Along with there, consume a lot of water everyday. With proper diet and exercise, if worked out for at least 2 months, you will see great results.