A breast pump device (100) is provided with a breast receiving portion (130), a pressure source (120) for generating an over- or under pressure, a controller (110) and a breast detector (140) for detecting a first state when no breast is in the breast receiving portion and a second state when a breast is in the breast receiving portion (130). The controller (110) changes a parameter of the breast pump device and/or outputs a notification if the breast detector (140) has detected the second state. Hence, the controller of the breast pump can take an action when the breast has been detected in the breast receiving portion.
