Is it possible to flatten your tummy after having children?

jennhast27

Hi All!
I have had 3 children in the past 6 years. I love my children dearly buy I am officially done having kids. So now my goal is to lose some weight and try to flatten this stretched out tummy. I have lost about 16 lbs so far but I really don't see a difference in my tummy. But my clothes are getting loose on me so something must be happening. I try crunches but don't always have the time to do them everyday. I love to walk but not much of a runner. Any advice out there would be great!