Why is my niece only 1 1 years old this year, and her breasts are more exaggerated than her peers? Why?

Nowadays, children are developing rapidly, and everyone has different stages of development. She may have family genetic factors, or she may eat better and secrete more estrogen. As long as it's not particularly exaggerated, it's okay. But be careful not to give her too much KFC or chicken legs in the supermarket. Now these meats contain a lot of hormones. If children eat too much, it will affect the normal hormone secretion and may get fat abnormally.