Quick answer
Measure your nipple base in millimeters, then choose the Shield Maiden size closest to that measurement: 17mm for smaller bases, 24mm for medium, and 27mm for larger bases. Always check the fit during a feeding and adjust if you see compression or gaps.
Why measuring the nipple base matters more than guessing
Nipple size changes with pumping, feeding, and temperature, so a size that felt right yesterday may feel different today. Measuring the base—not the tip—gives you a repeatable starting point. Shield Maiden shields come in 17mm, 24mm, and 27mm, and the right size should let your nipple move freely without rubbing the tunnel walls.
If you are between sizes, start with the larger size and assess comfort during a feed. A too-small shield can pinch or restrict milk flow, while a too-large shield may lose suction or allow milk to pool.
When to remeasure and what to do if fit changes
Recheck your size if you notice pain, reduced milk transfer, or the shield slipping during feeding. These signs often mean the fit is off, not that shields are unsuitable. Because Shield Maiden shields are made of food-grade silicone that is smooth on the mother’s side, they adhere well when the size is correct; a shield that constantly detaches may be too large or need repositioning.
Keep in mind that sizing is a starting point, not a permanent label. Many mothers use different sizes on each breast or switch sizes as their body recovers postpartum.
How to size and check fit step by step
- Measure your nipple base: Use a ruler or measuring tape to measure across the base of your nipple in millimeters, not the tip. Measure both nipples, as they can differ. Common mistake: measuring the areola instead of the nipple base, which leads to an oversized shield. Write down both measurements so you can compare them to the size chart.
- Match your measurement to the closest Shield Maiden size: Choose 17mm if your base measures near 17mm, 24mm if near 24mm, and 27mm if near 27mm. If you fall between sizes, start with the larger size. Checkpoint: do not force a size that feels tight before feeding. If you are unsure, the 3-pack with one of each size lets you try all three.
- Test the fit during a feeding: Center the shield over your nipple and start a feed. Your nipple should move freely in the tunnel without touching the sides, and the shield should stay adhered without constant holding. Watch for compression lines or pain, which mean the tunnel is too narrow. Stop and adjust if you see milk pooling inside the shield or if suction feels weak.
- Recheck after the feed: Remove the shield and look for red marks or discomfort on your nipple. A well-fitting shield should not leave deep indentations. If it does, try the next size up. Checkpoint: a shield that leaves marks may be too small even if it felt fine during the feed. Keep a note of which size worked on each breast for future feeds.
Product facts
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Shield Maiden Nipple Shields - 17mm, 24mm, 27mm: Shield Maiden Nipple Shields are available in 17mm, 24mm, and 27mm sizes, with options for a 2-pack or a 3-pack containing one of each size. The multi-size pack lets you test all three sizes without committing to one, which is useful if you are unsure of your fit.
Shield Maiden Nipple Shields - 17mm, 24mm, 27mm
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Shield Maiden Nipple Shields - 17mm, 24mm, 27mm: The shields are made of laboratory-tested, food-grade silicone with a velvety texture on the baby’s side and a smooth surface on the mother’s side. The smooth back adheres well to the breast, while the textured front may feel more natural for your baby during feeding.