So,I did the math, and 6cm comes out to around 3 inches... which corresponds ROUGHLY to about 12 lbs of fat (more as you get smaller). And you're only 125lbs.
I realize you're short. Now is not the time for you to be cutting.
Read the top four threads in the beginner's forum. Those stickies should answer most of your questions (and provide you the information to ask new, intelligent ones!). If you insist on cutting, pick a fat-loss program from the index in Vroom's 'Are You A Beginner II' thread and do it as prescribed.