Tummy reducing

Patient: Hello this is suchita fromindia. ihad c-section delivery 2 years ago. sine then i have gained so much weight 62kg. earlier i was 50. and also my tummy looks like i am still 6 months pregnant. my age is 25 but i look like 40. plz consult me asap. i used gym n lost 6 kg but after leaving i gained same as before. plz guide.