Loosing baby weight after pregnancy! Tummy Fat!

Hi all

I gave birth to my first child 18 months ago now. I've had my time of not having a worry in the world about the way that I look, but now I would like to loose all the extra fat I have left on my body!

I started a healthy eating plan last week and lost 4.5 pounds in my first week and would like to keep this up! I just need to know what is the best exercise to lose and tone up the fat on my belly?

Any tips would be greatly appreciated :)