Essential Guide to Measuring Your Nursing Bra Size During Pregnancy and Postpartum
- Idan Lev-Ran
- Mar 31
- 3 min read
Pregnancy and the postpartum period bring many changes to your body, especially your breasts. These changes can make it difficult to find a nursing bra that fits well and provides the comfort and support you need. Since your size can change weekly, knowing how to measure your nursing bra size accurately is key to staying comfortable throughout this journey.
Why Measuring Your Nursing Bra Size Matters
Your breasts grow and fluctuate during pregnancy and after birth due to hormonal changes and milk production. Wearing the wrong size can cause discomfort, skin irritation, and poor support, which may affect your posture and breastfeeding experience. Measuring your size regularly helps you:
Choose bras that fit well and support your changing shape
Avoid spending money on bras that won’t fit soon
Prevent discomfort and skin issues caused by tight or loose bras
When to Measure Your Nursing Bra Size
Your breast size can change frequently during pregnancy and postpartum. It’s best to measure:
Every 2 to 3 weeks during pregnancy after the first trimester
Immediately after birth, as your breasts may feel fuller or softer
Weekly during the first few months of breastfeeding, when milk supply fluctuates
Regular measurements help you adjust your nursing bra collection to your current size.
How to Measure Your Nursing Bra Size at Home
You will need a soft measuring tape, a mirror, and a well-fitting non-padded bra or no bra at all. Follow these steps:
1. Measure Your Band Size
Stand straight and wrap the tape measure snugly around your ribcage, just under your breasts.
Make sure the tape is level and not twisted.
Breathe normally and take the measurement in inches.
If the number is odd, round up to the nearest even number (e.g., 33 inches becomes 34).
This number is your band size.
2. Measure Your Bust Size
Wrap the tape measure around the fullest part of your breasts, usually at nipple level.
Keep the tape comfortably snug but not tight.
Stand naturally without pushing your breasts up or down.
Take the measurement in inches.
3. Calculate Your Cup Size
Subtract your band size from your bust measurement. The difference determines your cup size:
0 inches = AA cup
1 inch = A cup
2 inches = B cup
3 inches = C cup
4 inches = D cup
5 inches = DD or E cup
6 inches = DDD or F cup
For example, if your band size is 34 inches and your bust is 37 inches, the difference is 3 inches, which means a C cup.
Tips for Measuring During Pregnancy and Postpartum
Measure when your breasts are at their fullest, usually in the morning or after feeding.
Avoid measuring right after exercise or a hot shower, as swelling can affect size.
Use the same measuring tape and method each time for consistency.
Write down your measurements to track changes over time.
Try on nursing bras in your current size before buying to check comfort and fit.
Choosing the Right Nursing Bra Based on Your Measurements
When shopping for nursing bras, consider these factors:
Adjustability: Look for bras with multiple hook settings to accommodate size changes.
Soft, stretchy fabrics: These provide comfort and adapt to fluctuations.
Easy nursing access: Clasps or panels that open easily for breastfeeding.
Wide straps and supportive bands: Help distribute weight and reduce shoulder strain.
If your measurements fall between sizes, choose the larger size for comfort.
Signs Your Nursing Bra Needs Replacing
Even with regular measuring, your nursing bra may wear out or stop fitting well. Replace it if you notice:
Straps digging into your shoulders or slipping off
Band riding up your back or feeling too tight
Cups wrinkling or gaping
Discomfort or skin irritation
Difficulty nursing due to tight clasps or panels
Having a few nursing bras in rotation helps you stay comfortable as your size changes.
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