Looks like normal shrinkage cracking, if this is a relatively new build. Pretty much any new build will tend to suffer from slight shrinkage/settlement cracks like this for the first year or two, as the house dries out and stabilises. It will generally be a bit worse if the house sits with a relatively low internal humidity level, as this will be a lot lower than when the house was built, and if the house was wet plastered then there will be a very big humidity difference between the period when it was being plastered, where it may literally have been dripping wet inside, and when completed when it will tend to be a lot less humid.