Sure. She's only 5 and, as you said, it's a "phase." Next week it may be gone. Save the battles for something else (like going to bed on time or not fighting with the siblings or whatever). A lot of problems go away by themselves, especially when kids are very small. It sounds to me like she is experimenting with her sense of fashion and her own personal style. Individuation - claiming her own unique identity - is a good thing. You can encourage her with statements like, "You really know what you want to wear, don't you!" Picking out one's clothing is an important skill. You decide what you want to wear every morning - why shouldn't she? Giving her permission to be blue for awhile will help her take control over this small part of life. For kids, this kind of empowerment is very healthy - so much is really out of their hands. In summary then, let her wear blue.   Sarah Chana