Five months? HA! It took me nearly 6 YEARS to lose the baby weight, and I had mine one at a time. Still working on it actually, the holidays have had me in a holding pattern. Of course, the first 4 years I didn't even try, because what's the point when I knew I was going to have a second child and gain it all back, right? Queen of excuses at your service here
One day at a time, no "diets", just "healthy lifestyle choices". It pays off in the long run, believe me.