Pictures would help but it's pretty tough to diagnose slab surface defects from afar. There are any number of factors related to the concrete, weather and finishing process that could be to blame. I agree with Cobbler, the first step is to call your contractor assuming there is one.
Small hairline cracks spiderwebbing over the surface is called crazing and isn't unusual and isn't anything to be too worried about but the 'flaking' might be a cause for concern.
In the meantime, you are hopefully curing your slab to ensure maximum strength gain especially on the surface. Kindly keep us informed please.