Flat chest is also known as small breast syndrome, breast development varies from person to person. The remedies for flat chest are eating more collagen-rich food, breast implant and autologous fat breast augmentation. 1. If the development period is not over, you can eat more collagen-rich foods, which can effectively promote breast development, common foods are pig’s trotters, milk, eggs, etc., pay attention not to press the breasts, and women in the developmental period should choose underwear suitable for themselves. 2. If the developmental period has ended, the remedy for flat chest is breast augmentation with implants, currently the most commonly used implants are silicone implants, implants are mostly placed under the pectoralis major muscle or under the glands, and generally do not affect breastfeeding. 3. Autologous fat breast augmentation is to suck the patient’s own fat from the lower abdomen or inner thighs, and after several times of in vitro processing, inject it into the breast subcutaneous or glandular, but the autologous fat is easy to be absorbed, and needs to be injected several times. Surgical breast augmentation is recommended to go to a regular hospital to avoid great surgical risks.