2007 Dodge Caliber high pitched squealing noise

I have a 2007 Dodge Caliber. I recently started hearing a high pitched squealing noise. This starts after I use the brakes 5 times or so. The squealing noise ceases when the car is at a complete stop. I had new front brakes put on 6 months ago. Can you offer me any suggestions on what the noise could be, any suggestions are greatly appreciated.