
Yeah it happens when your hormones change. It can be from going onto birth control or going off of birth control (or other hormones) or if you had been doing something that was decreasing your estrogen before and stopped doing it, or could be “second puberty” that women commonly experience
Yeah there’s a couple reasons: One typically chests can grow up until 23ish years old. Two is the hormones, women go through what we typically call a “second puberty” which involves things like the widening of the hips, thighs getting larger, etc. Three it could just be new weight distribution