What if I declare early but I change my mind?
As a college student, you've got a lot of decisions to make besides your major, such as what classes to take, when to study, whether to work, and whether to ask your chemistry lab partner out on a date. Chances are, you'll change your mind on some of your choices. Your major is no exception. Colleges expect that you might change. That doesn't mean they make it easy.
Changing your mind is normal. Remember, you are going to be exposed to areas of study and potential careers that you have probably never thought of before. For many majors, a core of general studies is required and can be pretty transferrable from one major to another. For some majors, you must take specific courses (prerequisites) during your first and second year before you can even be considered eligible for upper-level courses. So, changing your major may result in an additional semester or two of coursework to meet graduation requirements.