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 One / Aio breast shields: 21mm / 24mm / 27mm / 30mm / 36mm

Express Cups / The INs / embody Silicone Breast Shields: 24mm / 28mm

Massage Cushions*: 21mm / 24mm / 27mm

Small Breast Shields#: 18mm / 22mm / 26mm

*Massage Cushions: 21mm cushions should be used with 24mm breast shields or silicone breast shields; 24mm cushions should be used with 27mm breast shields; 27mm cushion should be used with 30mm breast shields

#Small Breast Shields: 18mm/22mm small breast shields should be used with 24mm breast shields or silicone breast shields; 26mm small breast shields should be used with 28mm silicone breast shields

 

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