Nursing & Pumping Bra Size Guide
Track measurements through pregnancy and lactation, adjust support levels as supply changes, and keep comfort top-of-mind with our calculator workflow.
Measurement cadence
Late pregnancy (weeks 34–40)
Cadence: Capture a calculator baseline plus the looser sister band for immediate postpartum wear.
Measure weekly as the ribcage expands.
Early postpartum (0–6 weeks)
Cadence: Swelling, engorgement, and milk supply can shift sizes quickly—choose flexible bands and wire-free support.
Measure every 1–2 weeks.
Established nursing (6+ weeks)
Cadence: Record both pre-feed and post-feed fits to understand variance and trigger replacements when bands stretch out.
Measure monthly or after feeding routines change.
Support options
Drop-cup nursing bras
Classic clips allow one-handed feeding. Ensure straps stay supportive when a cup is unclipped—adjust band tighter if needed.
Pumping-friendly bras
Look for layered front panels or insert slits. Use the calculator to keep band snug so flanges stay in place during sessions.
Sleep & lounge bras
Wire-free bralettes handle night feeds. Keep the looser sister size on hand for engorgement days and hot weather.
Comfort & care tips
- Rotate between daytime support bras and softer night bras to give bands time to recover.
- Use nursing pads or moisture-wicking liners to protect fabrics and reduce odor.
- Log any plugged duct or mastitis events in the measurement template—swelling can temporarily change fit.
- Wash bras gently in cool water to maintain elasticity, especially around clips and band seams.
Helpful tools
Frequently asked questions
Should I size up before giving birth?→
Measure two to three weeks before due date and keep the looser sister size ready. Postpartum swelling often relaxes; adjust once supply stabilizes.
Can I wear underwire while nursing?→
Only after lactation consultants or doctors approve. Many prefer wire-free styles early on to avoid clogged ducts; soft underwires can be introduced later.
How many nursing bras do I need?→
Aim for at least three: one in use, one resting, one washing. Add a pumping-specific bra if you pump frequently.