Size 1 (21 ml) is recommended for first-time cup users, those with a light to medium flow, and those with a low cervix.
Size 2 (28 ml) is recommended for people with a heavier flow, who have had birth, or who have a high cervix. If you're unsure whether you have a high or low cervix, we recommend asking your doctor.
When in doubt, opt for Size 1, and if for any reason you aren't delighted with the product or fit, please reach out to us and we'll make it right. For additional information on how to use a menstrual cup, visit Blood + Milk.