Please check the measuring position in the picture +4mm is equal to the ideal breast shield size

As long as the measurement is correct, it will fit comfortably

The breast shields sizes are: 18mm/19mm/21mm/24mm/27mm/30mm/36mm

Silicone massage cushion: 21mm

(18mm/19mm breast shields and 21mm massage cushions cannot be used independently, they must be placed inside the 24mm The One breastshields or 24mm Express Cup silicone breast shields [combined] to use)

 

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