Written and maintained by CASRAI Editorial Board
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General product and regulatory information for clinic and supply staff. It is not medical advice and does not replace assessment by a qualified lactation professional.
Short answer
A flat nipple shield is the term searchers use for a nipple shield used with flat nipples. In the FDA’s product classification a nipple shield is a Class I device (21 CFR 880.5630), exempt from 510(k) premarket notification. Institutional documents describe shields as a temporary aid used with skilled support, not a routine first response.
Definition and scope
The FDA Product Classification database lists product code HFS, “Shield, Nipple”, under regulation number 880.5630 (“Nipple shield”). It is a Class I device, not implanted and not life-sustaining, reviewed under the General Hospital panel. The entry states that the device is exempt from 510(k), that manufacturers should confirm the limits of that exemption in 21 CFR Parts 862–892, and that establishment registration still applies (FDA Product Classification database, checked 30 October 2026).
The NHS Wales sheet uses the phrase “inverted or flat nipples” for a situation in which a shield may be considered. Neither it nor the FDA entry describes a separate “flat” shield design, so this page treats “flat nipple shield” as a search phrase for a shield used with flat nipples, not as a distinct product class.
How shields are used in practice
The NHS Wales (Cardiff and Vale University Health Board) maternity information sheet says shields can be temporarily useful in the early days of breastfeeding but can also create breastfeeding problems. It lists these situations where shields can be useful: inverted or flat nipples, a baby refusing to breastfeed when milk supply is evident, and a premature baby adapting to feeding directly at the breast. It advises skilled support, a well-fitting shield and use for as short a period as possible; the sheet gives 24–48 hours at the beginning of a feed as an example.
The Virginia Department of Health WIC policy BF 04.7 (“Nipple Shields”, effective 6 January 2025) states that nipple shields are medical devices and that inappropriate use may mask breastfeeding problems and reduce breastfeeding duration.
Types and related terms
Silicone nipple shield
Medela describes its Contact Nipple Shields as silicone, offered in three sizes (S 16 mm, M 20 mm, L 24 mm), supplied sterilised in a single pack, and “BPA free”. The manufacturer calls them a “temporary solution” for breastfeeding mothers, to be used under “professional guidance” and “appropriately sized and fitted” to the nipple (Medela product page, checked 30 October 2026). That is one manufacturer’s statement about one product and is not a rule for every shield.
Other labels people search for
“Nipple shield types”, “nipple shield silicone” and “breastfeeding silicone nipple shield” all point to the same device category. The FDA classification covers the category without distinguishing shapes or materials, so this page does not rank or compare them.
Where it matters for labs, clinics and supply decisions
Two institutional documents give a practical cross-walk. Each is a statement by one named body, not a universal rule.
| Topic | NHS Wales (Cardiff and Vale UHB) sheet | Virginia WIC policy BF 04.7 |
|---|---|---|
| Who is involved | Skilled support is advised | Issued only by the Breastfeeding Coordinator or Designated Breastfeeding Expert, or on referral from a WIC, hospital or community IBCLC |
| Duration | As short a period as possible (example: 24–48 hours, start of feed only) | Follow-up counselling contact within one week; refer back to an IBCLC if latch problems do not resolve |
| Reuse | Not addressed in the sheet | Issued shields “cannot be reused due to risk of cross-contamination” |
| Cautions | Can lead to mastitis because breasts do not always drain efficiently; can make it harder for the baby to reach the milk duct junctions | May mask breastfeeding problems and reduce breastfeeding duration |
For supply staff, the regulatory points are the Class I status, the 510(k) exemption and the registration requirement above. For background on those terms, see the CASRAI entries on the FDA registered establishment, the Medical Device Amendments of 1976 and Medical Device Reporting, and the guides on FDA device classification, 510(k) and PMA and the 510(k) premarket notification.
Common misunderstandings
- “Sore nipples are a reason to use a shield.” The NHS Wales sheet says sore nipples are not usually a good reason for using nipple shields.
- “A shield is just an accessory.” The FDA lists it as a regulated Class I device, and the Virginia policy calls it a medical device whose inappropriate use may mask problems.
- “Class I exempt means no obligations.” The FDA entry still requires establishment registration and points manufacturers to the limits of the exemption.
FAQ
What is a flat nipple shield?
It is a nipple shield used with flat nipples. The NHS Wales sheet describes shields as useful for inverted or flat nipples; it does not define a separate “flat” design.
How is a nipple shield regulated in the United States?
As a Class I device under 21 CFR 880.5630, product code HFS, exempt from 510(k), with establishment registration required.
Are silicone nipple shields a different category?
Silicone is a material. Medela’s silicone shield is one example; the FDA classification covers the device category without naming a material.
Can a shield be reused?
Virginia WIC policy BF 04.7 says shields it issues cannot be reused because of cross-contamination risk. Follow the manufacturer’s instructions for any specific product.
Sources
- FDA Product Classification, product code HFS “Shield, Nipple”: accessdata.fda.gov (checked 30 October 2026)
- Cardiff and Vale UHB (NHS Wales), Maternity information sheet “Nipple Shields”: cavuhb.nhs.wales (checked 30 October 2026)
- Virginia Department of Health, WIC policy BF 04.7 “Nipple Shields”, effective 6 January 2025: vdh.virginia.gov (checked 30 October 2026)
- Medela, Contact Nipple Shields product page: medela.com (checked 30 October 2026)
