If a girl wears a navel dress, there are many big holes around her navel, and the whole lower abdomen is exposed, which will inevitably absorb a lot of cold through acupuncture points, making the uterus cold, leading to dysmenorrhea in the future and suffering for life. What's more, it will lead to infertility in the future. Even if pregnant, the child will still be stillborn due to palace cold in a few months. There have been too many such cases in recent years. You can search carefully on the internet, which is by no means sensational. I teach Chinese medicine.
Teacher, I suggest not to wear it! Parents with physical problems dare not hurt them.