Breast Pump

A breast pump shaped at least in part to fit inside a bra and built to accumulate milk (M) expressed from a breast of a lactating mother in a milk container, the breast pump comprising

• a housing,
• a suction source,
• a breast shield element with a nipple tunnel adapted to receive a nipple,
• a sensor means including an emitter for an emission of electromagnetic waves and a receiver for a reception of the electromagnetic waves, designed to provide a sensor signal for a detection of the milk (M),
• a controller for controlling the suction source and adapted to receive the sensor signal, and
• a milk container adapted to contain a predetermined amount of expressed milk (M) and including a transparent section which is at least partially transparent to the electromagnetic waves and arranged to be in contact with the milk (M), and
• a transparent section having a protrusion arranged to be in front of and to face away from the corresponding sensor means in order to be wetted by the milk (M) and in order to reflect and/or refract the electromagnetic waves from the emitter.