Maternity Bra Sizing: Adjust for Changing Breasts

Quick answer

Your breast size can change several times during pregnancy and nursing, so adjusting your maternity bra fit is key to comfort and support. Follow these steps to know when and how to adjust.

How to adjust your maternity bra size for changing breasts

1. Measure your band every 4-6 weeks: Use a soft measuring tape under your bust, snug but not tight. If the band rides up or feels loose, go down a band size. A too-loose band reduces support. A firm band should stay level across your back.
2. Check cup fit at the same time: Scoop all breast tissue into the cup. If you see spillage, gaps, or the underwire (if any) sits on breast tissue, you need a larger cup size. For wireless bras, look for smooth coverage without bulging. Your nipples should point forward, not down or to the side.
3. Adjust the shoulder straps: Straps should lie flat without digging in or slipping off. If they dig, try a wider strap style. If they slip, tighten slightly, but if they still slip, your band may be too large. Straps should provide about 10% of support; the band does the rest.
4. Test the clip-down mechanism (if applicable): Unclip one side and check that the cup still covers your breast and the fabric does not bunch under your arm. If it pulls or gaps, the cup may be too small or large. You should be able to feed without removing the bra entirely.
5. Re-evaluate after milk supply regulates (around 6-8 weeks postpartum): Your breasts may settle into a more consistent size. If your current bra feels comfortable, you may not need further adjustments. If not, repeat the measuring steps. Keep one bra in your pre-pregnancy size for comparison.

Products mentioned in this guide

• Maternity Bra (Leakproof) - Twilight Blue: The Twilight Blue Maternity Bra has an innovative Dry Layer that absorbs leaks. This layer adds a small amount of thickness, so you may need to size up in the cup if you choose a leakproof style.

  

• Maternity Bra - Black Charcoal: The Black Charcoal Maternity Bra features a structured non-wire cup with an A-frame shape for feeding coverage. The A-frame design gives more room for breast expansion, making it easier to stay in the same cup size longer.