Bamboo Maternity Nursing Bra Size Guide
Find your size from your bra size
If you already know your pre-pregnancy bra size, find your dress size and cup below. Between two sizes? Choose the larger.
| A | B | C | D | DD(E) | DDD(F) | |
| 32(8) | S | S | S | S | S | M |
| 34(10) | S | S | M | M | M | M |
| 36(12) | M | M | M | L | L | L |
| 38(14) | M | L | L | L | L | XL |
| 40(16) | L | L | XL | XL | XL | XL |
| 42(18) | L | XL | XL | XL | XL | XL |
Don't know your size? Measure in two steps.
Step 1: Find your band size
Wrap the tape snugly around your rib cage, directly under your bust — if you're wearing an underwire, tuck the tape beneath it. Keep it flat and level all the way around. Exhale, then take the measurement, keeping your fingers out from under the tape. Match it to the chart below.
RIB CAGE MEASUREMENT |
YOUR BAND SIZE |
|---|---|
| 27–29" (68–74 cm) | 32 |
| 30–32" (76–82 cm) | 34 |
| 33–34" (83–87 cm) | 36 |
| 35–38" (89–96 cm) | 38 |
| 39–41" (99–104 cm) | 40 |
| 42" (105–107 cm) | 42 |
| 43–45" (109–115 cm) | 44 |
Step 2: Find your cup size
Wrap the tape loosely around the fullest part of your bust, flat and level. Inhale, then measure. Subtract your band size from your bust measurement — each inch of difference is one cup size.
Example: bust 38" − band 34 = 4" → you're a 34D.
See full cup chart
| BAND SIZE | 2" | 3" | 4" | 5" | 6" | 7" |
| 32 | 32B | 32C | 32D | 32DD(E) | 32DDD(F) | 32G |
| 34 | 34B | 34C | 34D | 34DD(E) | 34DDD(F) | 34G |
| 36 | 36B | 36C | 36D | 36DD(E) | 36DDD(F) | 36G |
| 38 | 38B | 38C | 38D | 38DD(E) | 38DDD(F) | 38G |
| 40 | 40B | 40C | 40D | 40DD(E) | 40DDD(F) | 40G |
| 42 | 42B | 42C | 42D | 42DD(E) | 42DDD(F) | 42G |
| 44 | 44B | 44C | 44D | 44DD(E) | 44DDD(F) | 44G |
Still not sure?
Order the size you think is closest. If it doesn't fit, we'll send a replacement free — no questions asked, with a 90-day money-back guarantee. Our bras are professionally fitted to run true to size.
One thing: if your size isn't on the chart, please don't order — the bra likely won't fit. Email us at support@mammabump.com and we'll help.