Breasts of women in their 40s are too small and can only be improved through surgery, such as autologous fat transplantation, implantation of implants and hyaluronic acid injections, etc. The breasts of women in their 40s are too small and can only be improved through surgery. 1. Autologous fat grafting: through their own fat can achieve the effect of breast plastic surgery, usually after suction can effectively change the size of the breasts, and has a better role. 2. Implant: Breast size can also be improved by implanting implants, but when choosing the implant, there may be displacement and rejection of the implant. 3. Hyaluronic acid injections: Hyaluronic acid injections take less time, have better results and faster recovery, but they are quickly absorbed and require multiple injections. If a 40-year-old woman’s breasts are too small, usually only through the way of surgery, it is recommended to choose a regular hospital to receive treatment.