These factors affect your cup size

18 Apr 2021Updated: 4 hours ago | 52 people are reading

These factors affect your cup size

© Editors Happy in Shape These factors affect your cup size.

Most body parts grow to a certain size and then stop. Your chest size, on the other hand, is a completely different story. Your breasts can change size and shape throughout your life. So what actually determines the size of your breasts?


Although it is easy to think that your cup size was predetermined, there are actually a lot of things that affect it. Here are the main factors that determine the size of your breasts.

1. Family history

Your genes determine almost everything. Your hair and skin color, how tall you are and a lot of other characteristics. They also have some influence on your chest size. It does not mean that you are guaranteed to have a C-cup if other people in your immediate family have it too. But you have a better chance of this than someone who comes from a family with a history of A-cups.

2. Weight

Your breasts form a complex part of your anatomy, consisting of supporting connective tissue, mammary glands and channels, and fatty tissue. How much of each tissue type you have varies per person. Some people have more supportive tissue than fat and vice versa. If your breasts contain a higher concentration of fatty tissue, you can see a difference in breast size when you arrive or lose weight. You will probably not see a drastic change when you gain or lose a few pounds. It should usually be a significant weight gain or decrease to change your breast size.

3. Training routine

Doing breast exercises can strengthen your chest muscles, four important muscles that are behind your breast tissue. If your chest muscles grow, this may cause your breasts to be pushed out slightly. Keep in mind that these exercises will not really increase your breast size, but that they can make the muscle behind the breast grow, making them appear a little larger.

4. Menstruation

Your menstrual cycle can change your breast size, texture and shape quite clearly. During the first half of your cycle, your body produces estrogen, a hormone that induces ovulation and stimulates the milk ducts in the breasts. But in the second half of the cycle (the closer you get to your period), progesterone stimulates the formation of mammary glands, which can cause swelling (and even a little pain). This can make you wonder why your breasts have suddenly grown. Eventually your breasts will return to their normal size and texture.

5. Contraception

Your contraception can do more than just prevent an unintended pregnancy and / or help regulate your period. Hormonal contraceptive methods, such as the pill and the hormonal coil, can actually affect your breast size. This is because the estrogen and progesterone in hormonal contraception cause something called edema or water retention. It is usually most noticeable when you are just starting birth control.

6. Pregnancy

Getting large breasts during pregnancy is a real phenomenon. A pregnant woman's breasts can grow several cup sizes during pregnancy thanks to hormonal changes. Although your breasts already have milk channels, progesterone helps your body to produce more channels and lobes, which are glands that produce milk. By the fifth or sixth month of pregnancy, your breasts are fully capable of producing milk. Your breasts may continue to swell during postpartum if you decide to breastfeed. Once you stop breastfeeding, your breasts will return to their old size in about three to six months.

7. Age

Your breasts are probably no longer the same as when you were 15, and it is very likely that they will look different again in a few years. As menopause approaches, hormonal changes affect the size and shape of your breasts. When the estrogen level falls, the connective tissue in the breasts becomes dehydrated and loses its elasticity. In addition, the breast tissue, which typically prepares to make milk, stops doing so and starts shrinking. With time your breasts will be less full and firm and that is completely normal.


If you notice that your breasts have sudden changes and you do not know why, it is important to contact your doctor. Do not panic immediately, but just have it checked.