I starting using Spanx a couple months after I had my son.  They are the best product ever made for smoothing and holding everything in.  They make your clothes look and fit much better.  I wear a pair of Spanx everyday.  I will not leave out of my house without them on.  I would recommend them to every woman out there.  They stay in place with no problems of falling down.  I would recommend that you go one size down from what the chart on the back says to use.    They are a little costly but worth every cent.  I have only found them at Dillard's.