Yippee – you’re pregnant! Bubs is growing beautifully and you need to buy new clothes and underwear. But how do you work out your new bra size?


This month Maggie clarifies the sometimes confusing issue of how to work out your own bra size. This is especially important during pregnancy changes. We are so pleased to be able to have Maggie write for us here at Yummy Mummy Lingerie. Here’s a little bit more about Maggie before you enjoy her latest post ……

Maggie Bates is a freelance writer based in Northern Ireland who produces content in a variety of mediums and a wide range of styles. She is passionate about writing and believes in the power of words, as a method for the communication of ideas. She currently produces content for online companies and organisations, including purecontent.com/ and uk.copify.com. This involves writing blogs, news and feature articles on a weekly basis. As a result, Maggie has excellent research and organisational skills. She also runs her own recreational blog, writing about various topics including humour and topical pieces. Maggie’s writer profile can be found on Upworks

Enjoy Maggie’s helpful tips on measuring your bust to determine your bra size.

Measuring your bust for a bra

So, you’ve reached that point in your pregnancy when your breasts have started to change. This usually starts to happen around the eighth to tenth week. You may have noticed the shape and feel of your breasts altering. As your pregnancy progresses they will become both larger and more sensitive. Therefore, it is important for you to know how to measure for the right bra size. You want to be as comfortable as possible during the course of your pregnancy, therefore, several good quality maternity bras are an essential part of your wardrobe!

So grab the tape measure and get in front of the mirror! Even better, ask the other half or a friend to help you!

Band size

First of all you need to determine your band size. You will need to wrap the tape measure firmly around the area just beneath your breasts, with the inch side facing out. If the number you see is even, then you should add 4 inches, and if it is odd then add 5. For example, if you measure 28 inches, then this would work out as 32 inches.

Cup size

You now need to measure the cup size. Take the measuring tape and wrap it around your bust, covering the fullest area of your breasts. You should keep your arms close into your body while doing so, to get an accurate measurement. Therefore, again, this is where enlisting someone else to help can be a good idea!

If needs be, you then round up the measurement to the next whole number, in order to be able to buy the right cup size. Therefore, if you measure 32.5 then your cup size will be 33 inches.

Now you have both bits of information that you need. You will then take the measurement for your band size and subtract this from the cup size measurement. This then equals your overall bra size. Therefore, in the example above this would be 1=B.

0 = AA
<1 = A
1 = B
2 = C
3 = D
4 = DD
5 = DDD/E
6 = F
7 = G
8 = H

Your breasts are unlikely to stay the same size throughout your pregnancy. Therefore, you will need to measure your breasts every 2 to 3 weeks as your pregnancy progresses to determine if you need a different bra size.

What to look for in a bra?

A good maternity bra should offer a decent level of support, with wide straps and firm under-bust band. The fabric of the bra should also cover the majority of your breasts, as this will help you stay comfortable as they become more sensitive. The bra should ideally offer a number of hook positions, in order to allow for prolonged usage as your breasts and ribcage change shape and size.

Remember, just because you are pregnant doesn’t mean you have to settle for frumpy or bland looking bras! There are now a wide range of lovely looking, comfortable and flattering bras on offer for all mums-to-be. Check out Yummy Mummy Lingerie’s range of fashion maternity bras, everyday bras and maternity activewear bras from brands such as Cake LingerieHOTmilk, You! Lingerie, Cantaloop, Beha Maternity, Freya Maternity, Cadenshae and Seraphine.

It is important that you take care of your breasts during pregnancy, so you may find you change your bra size a number of times. However, just remember, this gives you a chance to try out different styles of maternity underwear  and to keep your maternity wardrobe fun!

Use the guide above to calculate your bra size for buying online. However if you are in Perth, WA, please feel free to make an appointment to come and view our styles and try on sizes for yourself. Visit our contact us page for appointment times and to email us to make a time for yourself 🙂 We really look forward to meeting you.


Here at Yummy Mummy lingerie you can buy maternity bras and maternity wear – including maternity activewear  in a wide range of sizes – from 8A to 20E and beyond in some bra styles. If you need help with sizing or styles please do not hesitate to contact us on info@yummymummylingerie.com and we will be more than happy to help.

Leave a Reply

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.