La Leche League Sizing Charts

Sizing chart for maternity nursing bras and intimate apparel by La Leche League International (LLLI)

For bra size (in inches)

Measure just under the arms and high above the chest., round up to the nearest even size and this determines your bra size
For cup size (in inches

Measure the fullest part of bust. The difference between the two sizes determines your cup size:

Difference Between Two Sizes Cup Size
0-1½ “ A
1½" - 2½" B
2½" - 3½" C
3½" - 4½" D
5" - 6" DD/E
6" - 7" DDD/F
7" - 8" G
8" - 9" H

You may also use the following alternative measuring method:

While wearing a light-weight bra, measure around the chest directly under the bust, add 5" to that measurement, if it's an even number that is your bra size. If it’s an odd number, round up to the next even size. You can use this to compare to the measurement above.  
Purchase your nursing bra to fit  on the first (tightest fitting) hooks rather than the end (loosest fitting) hooks. As you progress through pregnancy you can hook the bra further towards the end, this allows your bra to adjust with your changing body.
It is typical to move up a few cup sizes and even a band size from pre-pregnancy to postpartum. Nevertheless, every body is unique. 
It is recommended to hand wash your La Leche League International maternity nursing bras and intimate apparel and hang them to dry. Although you might want the ease of machine washing and drying, this is the fastest way to ruin a bras' construction.

La Leche League Sizing for Tank Tops and Sleepwear

Size S S M M L L XL XL 2XL 2XL 3XL
Bust 33-1/2" 34-1/2" 35-1/2" 36-1/2" 38" 39-1/2" 41" 43" 45" 47" 49"
Waist 25-1/2" 26-1/2" 27-1/2" 28-1/2" 30" 31-1/2" 33" 35" 37" 39" 41"
Hip 36" 37" 38" 39" 40-1/2" 42" 43-1/2" 45-1/2" 47-1/2" 49-1/2" 51-1/2"

**Please Note - sizing may vary, depending on your body type
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