How to Choose a Nursing Bra Size After Birth
Why Your Size Changes Again After Birth
Many people size up during pregnancy, only to find their nursing bra needs shifting again once milk comes in, usually a few days after birth. Band size often stays close to your pre pregnancy measurement, while cup size can fluctuate through the day as milk builds up and empties with each feed. Buying before this settles down, typically two to three weeks postpartum, is one of the most common reasons a first nursing bra ends up feeling wrong.
How to Measure for a Nursing Bra
| Step | What to Do |
|---|---|
| 1. Band measurement | Measure snugly around your ribcage, directly under the bust |
| 2. Cup measurement | Measure around the fullest part of the bust, ideally when not overly full |
| 3. Compare the two | The difference between band and bust measurement gives an approximate cup size |
| 4. Try before fully settling | Choose adjustable styles where possible, since band and cup may still shift slightly |
Choosing the Right Style
Beyond size, the style of opening matters just as much for day to day comfort. A Front Button Nursing Bra gives quick, one handed access for feeds, which many people find easiest in the early weeks.
If you prefer a smoother line under clothing with no clasps to fiddle with, a Seamless Nursing Bra stretches to allow feeding while staying comfortable against sensitive skin.
If you are also expressing milk, it is worth choosing a bra that supports both feeding and pumping. A Hands Free Pumping Bra holds pump flanges in place without you needing to hold them, and for more on choosing between pump styles, see Wearable vs Traditional Breast Pumps Compared.
Signs Your Nursing Bra Does Not Fit
- The band rides up at the back rather than sitting level all the way round
- Underwire, if present, presses into breast tissue rather than sitting flat against the ribcage
- Straps dig in or slip down repeatedly through the day
- You need to unclip fully rather than open the cup with one hand for a feed
Frequently Asked Questions
What size nursing bra should I buy before birth?
Many people buy one size up from their pre pregnancy band and one to two cups up, but it is worth waiting until milk comes in to buy the bulk of your nursing bras.
Why does cup size change through the day?
Breast tissue fills with milk between feeds and empties afterwards, so cup size can genuinely shift by the time you are due to feed again.
Who should size up again after birth?
Anyone whose pregnancy bras now feel tight in the cup, or whose band has loosened as your body changes postpartum.
When does nursing bra size usually settle down?
Most people find their size stabilises around six to eight weeks postpartum, once breastfeeding is more established.
How many nursing bras do you actually need?
Three to four in rotation is typical, allowing for washing and the odd leak, without overbuying before your size settles.
Browse our nursing bras, or read What to Expect in the First Weeks Postpartum for more on recovery after birth.
-
Posted in
buying guide, nursing bras, postpartum
