Quick answer
Most people choose based on age, birth history and comfort
The Small is often recommended for people under 30 who have not given birth vaginally. The Large is often recommended for people over 30, those who have given birth vaginally, or anyone wanting higher capacity on heavier flow days.
Personalised recommendation
Take the 60-second menstrual disc size quiz
Answer five quick questions about your experience, age, birth history, flow and cervix height to get a starting size recommendation.
Why sizing matters
A better fit can mean fewer leaks
A well-fitting menstrual disc should sit comfortably in the vaginal fornix and stay tucked behind the pubic bone. When the size is right, the disc can collect fluid effectively without shifting or causing pressure.
If your disc feels unstable, leaks often or moves out of place, it may be too small. If it feels uncomfortable or creates pressure, it may be too large.
The my mimi sizing guide
The Small and Large menstrual discs are both reusable, suction-free and made from medical-grade silicone. The main differences are capacity and diameter.
Small
Holds up to around 5 regular tampons
Large
Holds up to around 7 regular tampons
What affects menstrual disc size?
Menstrual disc sizing is not only about flow. Age, vaginal birth, cervix height and comfort preferences can all affect which disc feels better in your body.
Flow can still matter. If you have a heavier flow, you may prefer the Large for higher capacity, even if the Small is your usual starting point.
Fit signs
How do you know if the size is right?
A well-fitting menstrual disc should feel secure, comfortable and almost unnoticeable once inserted correctly.
- You cannot strongly feel it during normal movement
- It stays tucked behind the pubic bone
- It does not slip down or feel like it is falling out
- It does not create pressure or discomfort
- It gives reliable leak protection when positioned correctly
When to consider Small or Large
When to consider Small
Small may suit you if you are under 30, have not given birth vaginally, have a lower cervix, or prefer a slightly smaller fit.
When to consider Large
Large may suit you if you are over 30, have given birth vaginally, have a heavier flow, or want higher capacity.
Why my mimi
Two sizes, one better fit
The my mimi menstrual disc is designed to make reusable period care easier to start. It is soft, suction-free, made from medical-grade silicone and available in two sizes so you can choose a better fit for your body.
