When we're talking about size, the most important dimension of a cup is length, not diameter. It should sit completely inside your vagina.

So how do you determine if a cup is too long for you? It's all about the height of your cervix.

The cervix is the lowest part of the uterus. It’s a small passageway connecting the vagina to the uterine cavity, about 2.5—4cm long.

The cervix helps to keep bacteria and viruses out of your uterus, and it opens and closes to let sperm in and menstrual blood out.

Measuring the height of your cervix is helpful when choosing which size might work for you.

How to measure the height of your cervix?

Since periods often affect our bodies physically, we highly suggest doing this around the time you're menstruating. Wash your hands thoroughly. Then, take your finger and slide it into your vagina. Keep going until you feel a soft roof past which you can not push, that's your cervix!

  1. If you can only get one joint of your finger in before feeling the cervix, then you probably have a low cervix.‌
  2. If you can get two joints, then you probably have an average cervix.‌
  3. If you can get the entire length of your finger, then you probably have a high cervix.

Generally, a bigger cup size is better for a higher cervix and a small is better for a lower cervix.


Light to medium flow.

Recommended for those who have not given birth vaginally.

Have a low to average cervix.

The diameter is 41 mm (1.6 inches).
The length 65 mm (2.6 inch).
The volume of the cup is 23 ml.
Measuring lines: 7.5ml and 15ml.


Medium to heavy flow.

Recommended for those who have given birth vaginally.

Have an average to high cervix.

The diameter is 45 mm (1.8 inches).
The length 68 mm (2.7 inch).
The volume of the cup is 28 ml.
Measuring lines: 7.5ml and 15ml.

Littlemiss cup is emptied about 4-6 times a day, and can be used overnight for up to 8 hours.

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