The following nursing bra size chart is a general guideline. Other manufacturers may have different sizing options. Also, your comfort level is the most important. No matter what the facts and figures say you ought to wear, only stick with those you are at ease with.
The fit is determined by the band size. After finding the band size, then you can select the style based upon the cup size. For rib band 32-36, the cup size is S (B-cup) for basic, S+ (C-D) for plus or S++ (DD-F) double plus.
For 36-40 rib bands, the sizes are M (B-C) for basic, M+ (D-DD) and M++ (DD-G). For 38-42 rib bands, the sizes are L (C-D) for basic, L+ (DD-E) for plus and L++ (DD-G for double plus. The nursing bra size for rib bands that measure 42-46 are XL (C-D) for basic, XL+ (DD-E) for plus and XL++ (E-G) for double plus.
How to Find Your Band Size
To get the band size, put a measuring tape under your arms and around the chest. The tape must be snug, not tight. Make sure you are standing up. Breathe normally.
The figure you get is the band size. If the figure is an odd number, round it off. If it is 37 inches, round it off to 38 inches.
How to Find Your Cup Size
The next step to finding your nursing bra size is to get your cup measurement. Put the tape at the fullest part of your breasts. This should be above the nipples. Ensure the tape measure is level to the body. Do not pull it tight.
The cup size is the difference in inches between the bust size and the band size. Assume the band measurement is 40. If the bust size is 45 the difference is 5 inches. That would be cup E. If the difference is 6 inches, it is an F cup. For 7 inches, it is a G cup and 9 inches, H cup.
Tips on Finding the Perfect Fit
When looking for a nursing bra size, ensure your measurements are correct. The tape measure should be set to the positions described earlier. The cups must be positioned appropriately. They should hold your breasts.
The band should be level to the back and front. The shoulder straps must not be too tight. The tension must be enough to just hold the bra in place. The straps are too tight if there are red marks on the shoulders.
A good fitting bra will also fit when secured on the center row of hooks. If your breasts are bulging out, choose a larger cup size but within that band. For instance, if you are wearing 36F, try moving up to 36G. If you can pinch material at the cup, then it is too big. Move down a cup size.
Choosing the wrong nursing bra size can lead to discomfort. By using the methods described earlier, you should be able to find the right size and proper fit.