If I Gain Weight Will My Boobs Get Bigger

As weight gain affects the overall body fat, it also has a slight effect on the breast tissues. However, there are other factors that may affect breast size with weight gain. Aging, hormonal changes, and genetics play a vital role in breast size.
If you have genetically smaller breasts, you are more likely to have smaller breasts even after weight gain. The changes in weight have no drastic effect, but yes, we can say that weight fluctuation can make the breasts look sagging.