How to Determine Your Bra Size

Because of widely differing body shapes, sizes and breast shapes, as well as styles of bras available, when shopping for a maternity/nursing bra, it is highly recommended that you are fitted by a specialist in bra fitting. This will ensure the best possible fit, comfort and support from your bra. Please remember these key points and take advantage of the expertise of the sales staff where you shop.
To determine your band size and cup size, you’ll need to take two measurements while wearing a good fitting, unpadded bra.

	For the band size, measure around the body, just under the arms, with a measuring tape. Remember to stand up straight and breathe normally. If the measurement is an uneven number, round up to the next even number.
	To determine your cup size, you’ll need to take a bust measurement around the body at the fullest part of the bust. Make sure the measuring tape is straight or level all around your body and lies flat against your back.
Subtract the band (first) measurement from the bust (second) measurement. The difference, as shown in the chart, will determine your cup size. Keep in mind, this may be only a starting point. Trying on the garment, especially with the assistance of a certified bra fitter, will determine which size and style of bra is best for you in terms of fit and comfort.
Putting on Your Bra to Ensure a Comfortable Fit You may find that with changing breast fullness, you are most comfortable wearing a maternity/nursing bra all the time. To ensure that you’re getting the best support and most comfortable fit, follow these recommendations:
	Before putting on a Medela bra, unhook the bra back and unfasten the outer cups. Fasten the bra in back, at the waist, snugly enough so that the bra will stay down below the shoulder blades.
	Wearing a bra too loosely around the rib cage will allow it to “ride up,” (shown in the photo at left) which in turn provides insufficient support for the breasts. The more the shoulder straps are tightened in an attempt to raise the breasts, the more the bra back will be raised above the shoulder blades.
	Now, bend over, letting your breasts fall away from your body. Take the bra by the top of the cups at the straps and pull up over your breasts, gently shaking the breasts into the inner cup frames.
	For prenatal wear, on the Lace Cup bra, use the top hook of the ladder where the shoulder strap joins the bra. Postnatally, you can adjust the size of the outer cup by lowering the cup one hook at a time as breasts become fuller throughout the day. The Seamless bra has no hook adjustment as the stretchable fabric accommodates changing breast fullness.
	Straighten up, adjust the shoulder straps for comfort and support, and slide your arms through the shoulder straps.
	Prior to fastening outer cups, bend over and shake breasts once more to ensure proper fit. Then fasten outer cups.
	As a last check, run your finger around the outside frame of the cup. You should feel your rib cage just below the bra. No part of the breast should be below the bottom edge of the bra. Each breast should be completely cradled in the cup of the bra so it is not squeezed in any way.
Checkpoints for a Perfect Fit
	As shown in this photo of a good fitting bra, be certain the cup is large enough to give you the necessary coverage. The cup should have sufficient depth to completely support the breast.
	This photo shows the proper fit of an underwire bra. The dotted line shows where the breast ends – sufficiently away from the underwire (lower line) to avoid causing pressure on any breast tissue.
	This photo shows the back of a good fitting bra. Note that it is level or parallel to the floor; not hiked up or riding above the shoulder blades. It also lies snugly against the back.
	In this photo of an ill-fitting bra, the cup is too small so the bra does not fit snugly against the rib cage, resulting in inadequate support. This may also cause the bra to ride up uncomfortably in back while it droops in front. A too-small cup size may also allow breast tissue to slip or bulge out from the bra.
	The bra should be snug in the girth, that is, around the bottom band. If not, as shown in the photo, the back may "ride up", causing the breasts to droop in front. If the bra seems to fit properly, but is still riding up in back, first try a larger cup size before going to a larger band size.
	Consider an underwire design only if you are accustomed to wearing an underwire bra and feel most comfortable wearing one while breastfeeding. With underwire maternity/nursing bras, it is especially important to obtain a proper fit, so the wire doesn’t put any pressure on the breast tissue.