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How to Measure Bra Size While Nursing

Measuring while nursing is different because your bust size can change throughout the day. The goal is to find a comfortable, supportive nursing bra size that works for you.

Quick Answer: Key Points

  • Measure when breasts feel comfortably full, not painfully engorged.
  • Size can change throughout the day.
  • Choose comfort and support over the exact number.
  • Re-measure as your body changes.

1. When to Measure While Nursing

When Breasts Feel Comfortably Full

Measure when your breasts feel comfortably full, not painfully engorged.

Avoid Measuring Right After Feeding

Right after feeding or when overly engorged can give you inaccurate results.

Size Can Change During the Day

Milk fullness, time of day, and activities can all affect your measurements.

Re-measure After Your Body Changes

Check your size every few weeks as your body adjusts (usually 6-12 weeks).

2. Step-by-Step Instructions

1

Wear a Soft Nursing or Non-Padded Bra

  • Choose a soft, unlined or lightly lined nursing bra with no underwire if possible.
  • Avoid compression sports bras.
2

Measure Your Underbust (Band)

  • Wrap the tape snugly around your ribcage, just under your bust.
  • Keep it level all around and breathe normally.
  • The tape should feel snug but not tight.
3

Measure Your Bust (Fullest Part)

  • Wrap the tape around the fullest part of your bust, usually across the nipples.
  • Keep the tape level and comfortably snug.
  • Do not pull the tape too tight.
4

Use the Result as a Starting Point

  • Nursing sizes are not always fixed.
  • Use your measurements to find a starting size, then adjust based on comfort and fit.
5

Check Comfort, Support, and Flexibility

  • Your bra should support without pinching.
  • Look for adjustable straps and multiple hook settings.
  • Choose flexible cups that adapt as your size changes.

3. Accuracy Notes

Nursing bra measurements are less fixed than regular bra measurements. Your size can vary based on:

  • Milk fullness (before or after feeding)
  • Time of day
  • Hormonal changes
  • Postpartum recovery

Because of this, focus on finding a range that feels supportive and comfortable, not a single "perfect" number.

4. Common Mistakes

  • Measuring when painfully engorged
  • Wearing a tight compression bra
  • Pulling the tape too tight
  • Treating one measurement as permanent
  • Choosing the label size over comfort

5. Nursing Bra Fit Tips

  • Look for stretch cups that adapt
  • Choose wider, padded straps
  • Use multiple hook settings
  • Pick a soft, flexible band
  • Allow room for size fluctuation

6. Use the Bra Size Calculator

Enter your underbust and fullest bust measurements to get your starting size. Then fine-tune based on comfort and fit.

Go to Bra Size Calculator

7. Frequently Asked Questions

8. Helpful Next Steps

How to Measure Band SizeLearn moreHow to Measure Bust SizeLearn moreSister Sizes ExplainedLearn moreBra Fit Problems & SolutionsLearn moreBra Size CalculatorCalculate now