Breast dysplasia in girls refers to the lack of glandular tissue in the breast, resulting in flat, curved breasts bilaterally or unilaterally. It may be accompanied by ipsilateral pectoralis major hypoplasia or absence of pectoral muscle, but the skin is still smooth and elastic. Breast dysplasia is mostly caused by congenital disorders, such as genetics, estrogen deficiency, pubertal dysplasia, and endocrine disorders during puberty. A few of them are caused by acquired factors, such as puberty breast binding, chest burns, scar contracture, lack of physical exercise, etc. Patients may present with small breasts, flattened breasts without contour, asymmetry, nipple invagination, giant nipples, etc. When patients have breast dysplasia, they should go to the breast surgery department of the hospital in time. Doctors can confirm the diagnosis through breast palpation, as well as the results of estrogen and endocrine function examination. Girls with breast dysplasia can be treated with appropriate estrogen supplementation and nutrition under the guidance of doctors. If breast dysplasia is genetic, it can be solved by breast augmentation in regular medical institutions. Those who are excessively thin should increase their weight appropriately, and at the same time strengthen physical exercise, especially the exercise of chest muscles, which can make the chest muscles fully develop and make the chest bulge to make up for the disadvantage of poor breast development. During the puberty and breast development stage, you should eat a reasonable diet, pay attention to balanced nutrition, take a diet high in protein, high in calories and rich in vitamins, eat more fresh fruits and vegetables, and correct bad habits such as picky eating and partial eating.