Spectra S1 - Breastshield Sizing and Fit Guide; Measuring Your Nipple Diameter

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Breastshield Sizing
Measuring Your Nipple
The Spectra S1 comes with size 24mm
breastshields. This is the most commonly
fitted shield size; however, many women
will fit better in other sizes. A properly
sized breastshield is important to ensure
the best performance of your pump. An
improperly fitted breastshield can hinder
milk output, cause discomfort, and in
extreme cases cause injury. To determine
the shield size you need, pump for 5
minutes using the provided shield(s). Your nipple(s) will expand while milk is
being expressed so it’s important to measure after it has swollen to ensure
the size you select will provide adequate room. After you pump, measure the
diameter of the nipple(s) at the base as illustrated in the image to the right.
Select a shield size that is 2-3mm larger than this measurement.
See below for fitting examples:
Shield is Too Small
Ideal Fit
Shield is Too Large
Nipple is not moving freely
within the flange: there
should be 2-3mm of space.
2-3mm of space around
nipple; a small amount of
areola may enter the flange.
Excess areola is drawn into
the flange, there is excess
space around the nipple,
and the nipple is being
pulled toward the end of
flange.