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Can You Wear an Underwire Bra While Breastfeeding?

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On the question of an underwire bra and breastfeeding: La Leche League International says bras with under-wiring, or other firm structure, can contribute to blocked ducts and even mastitis, and are best avoided in the early months. 1 The American Academy of Pediatrics advises avoiding tight tops, bras, or underwire bras to keep pressure off the breasts. 2

Key takeaways

  • La Leche League International says bras with under-wiring or other firm structure "can contribute to blocked ducts and even mastitis so are best avoided in the early months". 1
  • The American Academy of Pediatrics advises keeping pressure off the breasts by avoiding tight tops, bras, or underwire bras, and says you can go without a bra for a while if needed. 2
  • The NHS advises avoiding tight clothes or bras so milk can flow freely from every part of the breast. 3
  • A blocked duct left unrelieved could lead to mastitis, according to the NHS. 3
  • The NHS advises not buying a nursing bra too early in pregnancy - wait until the last month, then get re-measured 6 weeks after the baby arrives. 4

**A quick, honest note:** we're not medical professionals - everything here was researched by us from the public sources listed at the bottom of this page, and it isn't professional advice. Read our full note ↓

Can an underwire bra cause a blocked duct?

Underwire and other firm structure in a bra can contribute to blocked ducts, according to La Leche League International. 1 La Leche League states: "Bras with under-wiring, or other firm structure, can contribute to blocked ducts and even mastitis so are best avoided in the early months." 1

The American Academy of Pediatrics advises keeping pressure off the breasts "by wearing clothing that is not restrictive (avoid tight tops, bras, or underwire bras; if necessary, switch to a larger bra size, or go without a bra for a while)". 2 The NHS advises: "Avoid wearing tight clothes or bras so your milk can flow freely from every part of your breast." 3

Can a tight bra cause mastitis?

A bra that is too tight can cause soreness and problems such as blocked ducts, according to La Leche League International. 1 The NHS advises avoiding a bra or clothing that is too tight and puts pressure on the breasts, in the context of reducing mastitis risk. 5 The NHS also says: "It's important to deal with a blocked duct quickly as, if left, it could lead to mastitis." 3

La Leche League International advises that a bra should be big enough or stretchy enough to allow for expansion when the breasts fill. 1

Do you have to wear a bra while breastfeeding?

The US Office on Women's Health advises: "Wear a well-fitting, supportive bra that is not too tight." 6

La Leche League International puts it conditionally - it sets requirements *if* a bra is worn, rather than instructing you to wear one: "If you wear a bra, make sure it is well-fitting, supportive, and not tight." 7 The American Academy of Pediatrics lists "go without a bra for a while" as one option for keeping pressure off the breasts. 2

La Leche League International also says you might find it comfortable to wear a bra fairly often during the first 2-6 weeks of breastfeeding, when engorgement and very heavy breasts are common as the milk comes in, and that wearing a well-fitting bra more often may give extra support so the breasts do not become sore. 1

Which kind of bra do the sources describe?

The NHS notes: "A soft, non-underwired bra can be easily pulled up or down when you want to feed your baby." 8 Where a bra is worn, La Leche League International's requirements are that it be well-fitting, supportive, and not tight. 7

When should you buy a nursing bra?

The NHS advises against buying a nursing bra too early in pregnancy: "Don't buy your nursing bra too early in your pregnancy – wait until the last month to buy your first one, then get re-measured 6 weeks after your baby arrives." 4

Frequently asked questions

Can you wear an underwire bra while breastfeeding?

La Leche League International says bras with under-wiring or other firm structure are best avoided in the early months, because they can contribute to blocked ducts and even mastitis. 1 The American Academy of Pediatrics advises avoiding underwire bras to keep pressure off the breasts. 2

Can an underwire bra cause a blocked duct?

La Leche League International says under-wiring or other firm structure can contribute to blocked ducts. 1

Can a tight bra cause mastitis?

La Leche League International says a bra that is too tight can cause soreness and problems such as blocked ducts. 1 The NHS says a blocked duct, if left, could lead to mastitis. 3

Do you have to wear a bra while breastfeeding?

The Office on Women's Health advises wearing a well-fitting, supportive bra that is not too tight. 6 La Leche League International frames it conditionally: if you wear a bra, make sure it is well-fitting, supportive, and not tight. 7 The American Academy of Pediatrics lists going without a bra for a while as an option. 2

When should you buy a nursing bra?

Wait until the last month of pregnancy for the first one, then get re-measured 6 weeks after the baby arrives, according to the NHS. 4

A note from us

We're the team behind Yael & Michal. We are not doctors, nurses, lactation consultants, or psychologists, and nothing here is professional advice.

Everything above was researched by us from public, reputable sources - we name and link every one of them below - and summarized as carefully as we could, as a free resource for other mothers.

We try hard to get it right, and we cite our sources so you can check us. But we are not a medical authority, and this cannot replace talking to a professional who knows you and your baby. Please check anything that matters with your doctor, midwife, or an IBCLC lactation consultant.

If something feels urgent, contact your healthcare provider or emergency services.

Read our full Medical Disclaimer · How we research and write

Sources

  1. La Leche League International. https://llli.org/breastfeeding-info/bras/ (retrieved 2026-07-10).
  2. HealthyChildren.org (American Academy of Pediatrics). https://www.healthychildren.org/English/ages-stages/baby/breastfeeding/Pages/Clogged-Milk-Ducts.aspx (retrieved 2026-07-10).
  3. NHS. https://www.nhs.uk/baby/breastfeeding-and-bottle-feeding/breastfeeding-problems/breast-pain/ (retrieved 2026-07-10).
  4. NHS (Birth in Grampian / NHS Grampian). https://www.birthingrampian.scot.nhs.uk/infant-feeding/common-questions-and-challenges/do-i-need-any-special-clothes/ (retrieved 2026-07-10).
  5. NHS (National Health Service). https://www.nhs.uk/best-start-in-life/baby/feeding-your-baby/breastfeeding/breastfeeding-challenges/mastitis/ (retrieved 2026-07-10).
  6. Office on Women's Health (womenshealth.gov). https://womenshealth.gov/breastfeeding/breastfeeding-challenges/common-breastfeeding-challenges (retrieved 2026-07-10).
  7. La Leche League International. https://llli.org/breastfeeding-info/mastitis/ (retrieved 2026-07-10).
  8. NHS. https://www.nhs.uk/baby/breastfeeding-and-bottle-feeding/breastfeeding/breastfeeding-in-public/ (retrieved 2026-07-10).