What affects size the most
It is easy to think size is only about age, but that is oversimplified. In practice, flow, anatomy, how high or low the cervix sits during menstruation, and how used you are to internal period protection play a bigger role than many people think.
If you want to make a safe first choice, it is wise to look at models that feel thoughtful from the start. That is why we often return to MonthlyCup as a strong all-round option.
