Why It's Natural That Your Breast Size Fluctuates

September 14, 2018 1 Comment

breast fluctuation - house of anesi - comfortable bra

Ever wonder why your bra fits you fine one day, but you’re wrestling with it the next?

Ever wonder why your bra fits you fine one day, but you’re wrestling with it the next? Boobies are constantly fluctuating in size and shape, so we sat with Dr. Jenna Miller to better understand why.

Breast size changes during the menstrual cycle, pregnancy, menopause, and when there is weight loss or gain.

Hormones are the mas­ter puppeteers that manipulate our breast size and menstrual cycles. The two main hormones that play a role in controlling our breast fluc­tuations are estrogen and proges­terone. These are both naturally produced by the female ovaries.

The amount of the hormone produced vary depending on a woman’s:

  3. AGE


There are three phases that occur during the menstrual cycle: menses, the follicu­lar phase, and the luteal phase.

breast fluctuation


Menses marks your period (days 1-7). The uterus wall or endome­trium begins to shed due to low­ered progesterone if no pregnan­cy occurs. During this phase, the boobs feel lumpier and their tex­ture changes. Milk glands may still be enlarged as the body was pre­pared for a possible pregnancy.


After ovulation, estrogen starts to decrease and progesterone starts to increase marking the beginning of the luteal phase. This phase ideally lasts from days 14-28. The low lev­els of estrogen cause the boobs to be asymmetrical and the increas­ing levels of progesterone cause them to be swollen and tender in preparation for breastfeeding.


Following menses is the follicu­lar phase where estrogen is con­sistently rising. It peaks right be­fore ovulation at around day 13. During ovulation, the egg is re­leased from the follicle so this is the time you are most fertile. The increased estrogen in this phase makes the skin more elastic mean­ing your boobs are extra buoyant.



If pregnancy occurs, progester­one levels will not drop during days 1-12, but will remain high to maintain the uterus lining so that the fertilized egg, or the egg fused with the sperm, can devel­op into a fetus. Progesterone will thus carry on the pregnancy and cause swelling of the breast tis­sue. During pregnancy, the boob size fluctuates drastically based on the woman’s milk supply, how often she pumps her breast milk, and how much of each hormone is being secreted.



Menopause is marked by the lack of menstruation for a period of 12 months. Estrogen and progesterone both de­crease as the body is no longer trying to prepare for pregnancy. This means the tissue is softer and less en­gorged.



Boob size also fluctuates when a woman gains or loses weight. The breast is c­­omposed of fat cells, so it is only natural that when a woman loses or gains weight, her boobs do as well.


Female bodies change all the time whether it's due to our menstrual cycle, pregnancy, menopause, weight gain or weight loss, and we believe that it’s just common sense that our bra should do the same. That’s why we used engineering and tech to create a bra that adapts to your breast size changes.


You can now pre-order the Anesi bra


Liked this? Join our community of positivity and comfort here > SIGN UP 


1 Response


May 03, 2019

Boobpop enhancement serum really works! I have always had a 32 D natural but lately do yo yo weight loss my breasts keep fluctuating and I haven’t been able to fill up my bra cup. Well not now!! My breasts a firm, fuller and perky!!! I don’t even use this serum as directed twice daily and I have gotten results in just a few weeks. If I actually did it every day twice a day I think I’d prob grow a full cup size. This stuff works and I can’t wait to try the butt enhancement!!!

Leave a comment

Also in Blog

Appreciating Your Boobies 101 Event
Appreciating Your Boobies 101 Event

May 20, 2019

ALL BREASTS ARE BEAUTIFUL - so let’s have an event to celebrate them! Join us for a very special and fun night in Toronto on May 23d. 

View full article →

House of Anesi's Story
House of Anesi's Story

May 09, 2019

View full article →

Featured Story - Nipple Piercings and Breast feeding- Charlene Lizette
Nipple Piercings & Breast Feeding: Charlene’s Story Part 1

January 24, 2019

If you've had your nipple pierced, or thinking of having it done, and you are wondering if it will affect your ability to breastfeed, you need to read Charlene’s story!

View full article →

Bra Calculator

Bra Calculator

To get the perfect fit with your Anesi Bra. We make sure that everyone goes through our Sizing Calculator.

Sizing can range from brand-to-brand and is dependant on each garment, the materials, and the actual design. House of Anesi employs unique technology to fit your needs. Our bra adapts to your breast shape and size addressing your daily fluctuations. This is our unique superpower. The function stands Anesi Bra apart. For the same reason, our sizing chart is not matching standard sizing charts which you are accustomed to.

To determine your Anesi Bra size, you need to take proper measurement of your breast band and go through the questionnaire. Our smart calculator will prescribe you with your right size. To find your Anesi Bra size, fill the form below.

Bra Calculator