It is not only weight that affects breast development, but more importantly-estrogen. In fact, thin people can be divided into two situations. One is born thin, not fat after eating, and the other is malnutrition. Then the first one is not fat. If the chest is still not big, the supply of estrogen is generally insufficient. How to distinguish? You can observe feminine parts such as skin, hair and buttocks with the same light. When the secondary sexual characteristics of women are obvious, it means that estrogen is normal and the chest is still small, indicating that the real gene in the bones is small chest. ~ hehe, but if the buttocks, skin, etc. It's all a feeling of development. It's a sign of late maturity to wait. It will be fine in a few years.
Of course, if it is malnutrition, then everything is out of the question. So I hope to make a comprehensive evaluation instead of jumping to conclusions. Nutrition, hormones, people's mood and proper massage are all helpful to the development of the chest.
Wish you a happy life! If it helps you, please accept it, thank you!