This has absolutely nothing to do with your breast size - it’s all related to the amount of let down you experience. We have three sizes for you to choose from 40, 75 and 150ml. Our Ladybug is designed to be a breast pad alternative, sitting securely in your bra. You can choose to wear it with light suction or without suction (top plug open). So, instead of letting your precious milk soak up in a breast pad, Ladybugs can help you save every last drop. There’s an option for every Mama who experiences milk leakage whether while nursing, or throughout the day! The 150ml option was made for Mamas who experience a significant amount of let-down. Note: If you don’t have leakage then you won’t need the Ladybug.