Nursing Bra Size Calculator

Find your perfect nursing bra size for pregnancy and breastfeeding. Our specialized calculator accounts for breast changes during maternity and helps you find comfortable, supportive nursing bras.

Calculate Your Nursing Bra Size

What Makes Nursing Bras Different?

Size Changes

Breasts typically increase 1-2 cup sizes during pregnancy and breastfeeding. Measure regularly as your size may fluctuate.

Easy Access

Nursing bras feature clips or panels for quick one-handed access during feeding, unlike regular bras.

Extra Support

Wider bands, fuller coverage, and reinforced support accommodate heavier, fuller breasts during lactation.

Comfort First

No underwires (or flexible wires), soft fabrics, and gentle stretch ensure comfort during hormonal changes.

Nursing Bra Sizing Tips

  • Measure in your third trimester (around 36 weeks) for the most accurate pre-delivery sizing
  • Size up one band and 1-2 cups from your pre-pregnancy size when shopping early
  • Buy 2-3 bras initially, then remeasure 2 weeks postpartum when milk comes in
  • Choose bras with multiple hook-and-eye closures for adjustment flexibility
  • Opt for stretchy, breathable fabrics like cotton or modal for all-day comfort

When to Measure for Nursing Bras

During Pregnancy

Measure around 36 weeks pregnant. Your breasts are near their full pregnancy size but haven't yet filled with milk. This gives you a good baseline for nursing bras.

After Birth

Remeasure 2 weeks postpartum once your milk supply is established. Breast size may increase another 1-2 cups when milk comes in, so plan to adjust sizing.

Frequently Asked Questions

How many nursing bras do I need?

Start with 2-3 nursing bras, then buy more once your size stabilizes postpartum. Having multiple bras allows for washing and rotation.

Should I buy nursing bras before or after delivery?

Buy 1-2 bras in late pregnancy (around 36 weeks) for the hospital and early days. Purchase additional bras 2 weeks postpartum when your size is more stable.

Do nursing bras run different from regular bras?

Nursing bras often have more stretch and flexibility. They may feel looser than regular bras but this is intentional for comfort and size fluctuations during breastfeeding.

Ready to Find Your Nursing Bra Size?

Use our bra size calculator to get your accurate measurements, then shop for comfortable nursing bras that provide the support you need.

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