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How my breasts will change

Congratulations, you are pregnant…

As you may already know, one of the earliest physical signs of pregnancy is breast tenderness. At some point in your pregnancy, often but not always around the second month, your breasts will become larger as they prepare to nurse your newborn. Some women experience this as a feeling of fullness rather than an actual increase in size, while others know right away they need a larger cup size. Most women will increase two cup sizes over the course of their pregnancy, while others increase during their first trimester and not again until near the end of their pregnancy. Plus, as your belly blooms in size, your rib cage, or band, measurement will also likely increase. Hint: Women who are petite or carry high will often experience more increase in rib band than those who are taller or carry low.

Overall, in our experience, most women increase 1 or 2 cup sizes and 1 or 2 rib band sizes during their pregnancy.

First few days after giving birth…

For the first few days after giving birth, when you breastfeed, your baby receives colostrum. Around the third day, your milk will come in. At that point, you can experience an increase of 1 or 2 more cup sizes from your third trimester. Remember to relax. Hint: the size of your breasts (big or small) is not related to milk supply.

After six weeks of nursing…

Typically, after about 6 weeks to a few months of nursing, these fluctuations settle down. You’ll have established your breastfeeding relationship and routine, and you’ll probably reduce a few cup sizes. As well, around this point, your rib band will begin to reduce in size. Hint: it is normal for your body to hold onto those extra pounds while nursing, so don’t fret. Celebrate your new shape, and feel confident you are providing the best nutrition for your baby.  

This is the size you’ll likely stay until you finish breastfeeding—somewhere between your pre- pregnancy and pregnancy rib band size, and up 1 cup size.

Below are some examples to illustrate how your bra size will likely change:


Third Trimester

A few days after birth

A few months after birth

34 B

36 to 38 C/D

36 to 38 D/E(DD)

34-36 C

36 C

38 to 40 D/E(DD)

38 to 40, E(DD)/F(DDD)

36-38 D

36 D

38 to 40E(DD)/F(DDD)

38 to 40 F(DDD)/G

36-38 E(DD)

38 C

40 to 42 D or E(DD)

40 to 42, E(DD)/F(DDD)

38-40 D


If you have any questions about sizing feel free to contact us, our Bravado certified fitters are ready to take your call Monday to Friday, 9AM to 5PM EST at 800-590-7802