Round faces are different from chubby faces and differ in the facial features also. Basic geometry of the two kinds differs vastly from one another. A round face would have the perfect round shape with the length and the width of the face reading the same size while a chubby face might have extra cheek fat or extra fat due to body fat. Oval face shapes are the ones that would go with any kind of hairstyle. So one has to be very careful in choosing short hairstyles for round faces, as a wrong choice would make the face look more round and chubby.
Before choosing a short haircut you have to do a research between the short hairstyles. The beauty of the short hairstyles is that you can accommodate the shape to enhance or distract certain traits. So you have to be very careful in your choice. Some short hairstyles can make a round face seems enormous. Be sure that the hairstyle fits your face.