How to size a nipple shield
This is the question that brings most people to this page, and it is poorly answered nearly everywhere, so it goes first.
A nipple shield is sized by the internal diameter of its base in millimetres, and that measurement refers to your nipple, not your areola and not your breast. Contact shields are commonly sold in 16mm, 20mm and 24mm. The number on the box is not a bra size and does not correspond to breast volume at all.
To measure: look at the base of the nipple where it meets the areola, and measure straight across that base, excluding the areola entirely. Measure when the nipple is at rest rather than immediately after a feed, when it will be temporarily elongated. A printed ruler or a simple measuring card works.
Then choose the shield whose base is closest to that diameter without being smaller than it. The nipple should sit inside the shaft of the shield without being compressed against the sides, and without a large amount of empty space around it. A shield that is too small pinches and restricts flow; one that is far too large pulls areolar tissue into the shaft and rubs.
| If your nipple base measures | Usually start with |
|---|
| Around 16mm or less | 16mm |
| Around 17 to 20mm | 20mm |
| Around 21 to 24mm | 24mm |
Sizes are not standardised between manufacturers, so a 24 in one brand is not guaranteed to match a 24 in another. If a shield has been fitted for you by a lactation consultant, stay with that brand and size rather than assuming the number transfers.
The more important question: should you be using one?
Nipple shields have a real place. They can keep a baby feeding at the breast through flat or inverted nipples, a shallow latch, prematurity, or damage severe enough that feeding without one is not survivable. Sometimes a shield is what keeps breastfeeding going at all.
They are a bridge, not a destination, and they need supervision. A shield changes how milk is transferred, and used long-term without support it is associated with a baby taking less milk and with supply falling as a result. That is not an argument against using one. It is an argument against using one indefinitely without anyone checking whether the baby is actually getting enough.
If you are using a shield, ask for a weighted feed with a lactation consultant, and have a plan for weaning off it or a clear reason for staying on it. Watch nappy output and weight gain rather than how a feed feels. The people who do badly with shields are almost always the ones who were handed one and then left alone with it.
Sore nipples: what is normal and what is not
Tenderness in the first week or two, particularly at the moment of latch, is common. Damage is not. Cracking, bleeding, blistering, or pain that continues through the whole feed and does not improve over days is a signal, and the signal is almost always about latch and positioning rather than about your skin.
Creams, pads and cups treat the symptom. They are worth having, and they are genuinely comforting, but none of them fixes the cause. If nipples are damaged, the highest-value thing you can do is have someone watch a full feed. An IBCLC watching your baby latch will find in ten minutes what a fortnight of balm will not.
Some specifics on what is here. Lanolin and similar balms keep the skin from drying and cracking further, and a purified lanolin does not need washing off before a feed. Silver nursing cups are popular, comfortable and protect the nipple from rubbing against clothing; the evidence that silver itself outperforms an ordinary moist-healing approach is thin, so buy them for the protection and comfort rather than for the metal. Hydrogel and hot-cold packs are for symptomatic relief, and cold is generally the more useful of the two for swelling. Disposable or reusable pads should be changed as soon as they are damp, because a warm wet pad held against damaged skin is how thrush and infection get their opening.
Breast pain that needs a provider, not a product
Nothing in this collection treats an infection. Contact your provider the same day if you have a firm, red, wedge-shaped area on the breast together with fever, chills or flu-like aching, if a sore area is not improving over about 24 hours, or if you feel genuinely unwell. That combination suggests mastitis, and it can progress quickly.
One piece of widely repeated advice has changed. The older approach of deep massage, heat and aggressive extra pumping to clear a blockage is no longer what is recommended, and it can worsen the inflammation and tissue swelling. Current guidance leans towards ice rather than heat, anti-inflammatory pain relief, gentle handling rather than deep massage, and feeding normally rather than emptying the breast harder. If you find advice telling you to massage vigorously and pump aggressively, it is out of date. Take the current version from your provider or an IBCLC.
Frequently asked questions
How do you measure for a nipple shield?
Measure the diameter straight across the base of the nipple, where it meets the areola, excluding the areola itself. Do it when the nipple is at rest rather than straight after a feed, when it is temporarily elongated. Then choose the shield whose base diameter is closest to that measurement without being smaller than it. The number on the box refers to your nipple, not to your breast or bra size.
What size nipple shield do I need?
Contact shields are commonly sold in 16mm, 20mm and 24mm. As a starting point, a nipple base measuring around 16mm or less suits a 16, around 17 to 20mm suits a 20, and around 21 to 24mm suits a 24. Sizes are not standardised between manufacturers, so if a lactation consultant fitted you, stay with that brand and size rather than assuming the number carries across.
What happens if a nipple shield is the wrong size?
Too small and it compresses the nipple against the sides of the shaft, which hurts and restricts milk flow. Too large and it draws areolar tissue into the shaft, which rubs and can cause damage of its own. Either way the usual sign is pain that is worse with the shield than without it, or a baby who feeds for a long time and still seems hungry.
Should I use a nipple shield?
They have a genuine place, for flat or inverted nipples, a shallow latch, prematurity, or damage severe enough that feeding otherwise is not tolerable. Sometimes a shield is what keeps breastfeeding going. The important part is that it is used with support rather than handed over and forgotten, because a shield changes how milk transfers.
How long can you use a nipple shield?
There is no fixed limit, but it should be a bridge rather than a permanent arrangement, and long-term use without supervision is associated with reduced milk transfer and falling supply. If you are using one, ask for a weighted feed with a lactation consultant and have either a plan to wean off it or a clear reason to continue. Watch nappy output and weight gain rather than how a feed feels.
Is nipple pain normal when breastfeeding?
Tenderness in the first week or two, especially at latch, is common. Cracking, bleeding, blistering, or pain lasting through the whole feed and not improving over days is not, and it usually points to latch and positioning rather than to skin that needs a better cream. Have someone watch a full feed. An IBCLC will often find in ten minutes what a fortnight of balm will not.
Do silver nursing cups work?
They are comfortable, they keep clothing off a sore nipple, and they hold moisture against healing skin, all of which helps. The evidence that silver specifically outperforms ordinary moist healing with a balm is thin. Buy them for the protection and the convenience rather than for the metal, and note they do not address why the nipple is sore.
When should I call someone about breast pain?
The same day, if you have a firm, red, wedge-shaped area together with fever, chills or flu-like aching, if a sore area is not improving over about 24 hours, or if you simply feel unwell. That pattern suggests mastitis, which can progress quickly. Note that guidance has changed: current advice favours ice, anti-inflammatory pain relief and gentle handling over the older approach of deep massage, heat and aggressive pumping.
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