A good nipple fit of the flange will provide a more comfortable and effective pumping experience.
Note that the Hegen Double Electric Breast Pump (SoftSqround™) gift set comes with 2 x Flange(SoftSqround™) 22mm that fit up to 18mm nipple size. Other flange sizes are sold separately.
16mm (Fits up to 12mm)
19mm (Fits up to 15mm)
25mm (Fits up to 21mm)
28mm (Fits up to 24mm)
31mm (Fits up to 27mm)