Hello ma.Did u have baby thru a CS,if yes we know dats d first reason for ur big tummy.Then what r u eating?I believe food is one of d main cos y we add weight.it's basically ur daily lifestyle dats affect ur weight.So u 'll need to watch ur diet.Then begin to indulge in exercises.For ur tummy do "Crunches" and "planks"u can browse d internet about it.also check for ketogenic diet.