Maternity underwear matters because breasts and body shape change during pregnancy. Choose supportive bras with wide straps, adjustable bands, and smooth seams. Sleep bras provide light support, and nursing bras come in several styles - drop-down, zip-front, and pull-aside. Measure periodically and prioritize comfort and adjustability over exact size labels.

Why maternity underwear matters

Comfortable, well-fitting underwear is a practical part of pregnancy wardrobe planning. As breasts and body shape change, the right bras, briefs, and sleepwear reduce discomfort, protect skin, and make later nursing easier.

Fit and when to check sizes

Measure yourself a few times during pregnancy. Your rib cage and cup needs often change, so try bras for fit rather than relying only on a number. Look for a band that sits level around the rib cage and cups that contain breast tissue without gaping or pinching.

Start support early

Many people find they need more support soon after pregnancy begins because breast tissue can become heavier and more sensitive. A supportive maternity bra with a wide, non-slip strap and a firm back panel helps distribute weight and reduce shoulder and back strain. Some sources recommend starting support bras in the first trimester for comfort, especially if you notice increased breast tenderness or size changes.

What a good support bra looks like

Practical features include broader shoulder straps, a wide back panel, soft but structured cups, and multiple rows of hook-and-eye closures to allow band adjustments as your rib cage expands. Inside seams should be smooth or lined to reduce irritation. These design elements give more lift and prevent digging into skin.

Sleep bras and comfort wear

Sleep bras or soft-compression sleep camisoles are useful both late in pregnancy and in the early postpartum weeks. They provide light support and reduce bouncing while you sleep, without the underwire or firm structure of a daytime support bra.

Nursing bras: timing and types

If you plan to breastfeed, consider trying nursing bras in late pregnancy or after birth to get sizing right. Nursing bras come in several practical styles: drop-down (clasp) cups, zip-front bras, wrap or crossover designs, and pull-aside or pullover models. Choose what makes feeding and comfort easiest for you rather than following a strict purchase timetable.

Plus-size and specialty options

Maternity undergarments are available across sizes and styles. Plus-size options and bras with extended band and cup ranges use the same supportive features - wider straps, reinforced backs, and adjustable closures - to offer reliable support.

Short checklist before buying

  • Try bras on with a nursing tank or t-shirt to check fit.
  • Prefer adjustable closures and several band rows.
  • Avoid underwires if they cause soreness; many modern maternity bras have soft-cup designs.
  • Buy at least one comfortable sleep bra and one supportive daytime bra; add nursing-specific bras when you need easy access for feeding.
Note: some specific measurements and timelines for breast-weight change and exact starting weeks for support recommendations vary by source. 1
  1. Confirm typical breast-weight increase during pregnancy (statement about gaining up to ~2 lbs per breast).
  2. Verify earliest recommended week (e.g., 'as early as eight weeks') for when support bras are commonly advised.

FAQs about Maternity Underwear

When should I buy maternity bras?
Buy supportive bras as soon as you notice size or comfort changes. You can add nursing bras in late pregnancy or after birth to ensure the best fit for breastfeeding.
Are underwires safe during pregnancy and breastfeeding?
Underwires are fine for many people but can cause soreness if breasts are very tender. If you experience discomfort or blocked ducts while nursing, try soft-cup or wire-free maternity bras.
What features make a bra supportive?
Look for wide, non-slip straps, a firm wide back panel, structured but comfortable cups, and multiple rows of hook-and-eye closures for adjustability.
Do I need a sleep bra?
A sleep bra or soft-compression camisole offers light support at night and can be helpful in late pregnancy and the early postpartum period, especially if breasts leak or feel heavy.
How do nursing bras differ from regular bras?
Nursing bras have easy-access features - drop-down clasps, zip-fronts, or pull-aside panels - that allow feeding without fully removing the bra, plus added room for postpartum size changes.