A breast shield arrangement (300) for a breast pump comprises a first sealing portion (310), a port (320) and an intermediate portion (330) coupled between the first sealing portion (310) and the port (320). The intermediate portion (330) comprises a circumferentially extending wall defining a first volume (V1) which is adapted to receive a part of a breast, a first end (331), a curved portion (332) and a second end (333). The curved portion (332) comprises a second sealing portion (332c) which is adapted to at least partially seal the curved portion (332) against the nipple (310), the areola (320) or the breast (200) when a vacuum is applied at the port (320) creating a second volume (V2) between the first sealing portion (310, 332c) of the breast (200). The curved portion (332) at the second volume is curved outwardly as seen from the first sealing portion (310).