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Breasts Grow in Pregnancy

The belly is not the only part of the body that gets bigger during pregnancy. The breast grows noticeably during the gestation period. This can happen as early as the beginning of the first trimester. Often a woman first notices breast changes and only then learns about her position.

The breast during pregnancy becomes more rounded. The mammary glands are filled and become sensitive and painful. It’s all because of the running mechanisms of preparing the body for lactation. They are caused by hormonal changes in the body of the expectant mother.

When Do Breasts Grow Start in Pregnancy?

A woman notices that her breasts are greatly enlarged from about the middle of the first trimester of pregnancy. She can no longer wear her old underwear, it is uncomfortable for her to sleep and it is cramped in her usual clothes.

Breast sizes grow significantly at the beginning of the second trimester. Breast size approximately doubles by the third trimester, but everyone is extremely individual. Many pregnant women do not complain about breast changes at all.


A pregnant woman notices weighting and discomfort in the breast already starting from the 6th–8th week after conception. Visually noticeable breast growth is observed by the 16th week of pregnancy. The belly at this time is not yet very large and the breast is already growing at an intensive pace. The size of a woman’s bra increases one and a half to two times in the third trimester by about the 36th-38th week.

Breasts Grow weeks

When will it end?

Intensive breast growth stops closer to childbirth around the 38th week. The breast will begin to fill up even more after delivery. Colostrum will be produced and then milk. His rush is sometimes so strong that the breast grows and becomes stone. You will have to be content with very large breasts while breastfeeding. This will continue until lactation is fully established and the child grows.

How Does it Feel?

The initial symptoms are almost harmless. The woman feels that her breasts have become denser and heavier. She feels discomfort during physical activity and sleep. Any touch on the breast causes pain of varying degrees. The breasts no longer fit in underwear that was previously suitable in size.


The symptom in a more acute form is characterized by a strong breast enlargement by the end of the first trimester. The mammary glands pulsate, hurt, there is an increase in temperature. Constant soreness and heaviness in the breast limit a woman’s life a little.


The breast in a mild degree of the symptom increases only closer to childbirth. The woman feels only some visual and structural changes in the rest of the period. The density of the breast increases, and the color of the nipples and the size of the areola change.

The success of lactation does not depend on the size and growth of the breast during pregnancy.

Prevention of breast changes

The breast is very much subject to changes during pregnancy, like the whole body. The skin is strongly stretched due to the growth of the mammary glands. There is a weakening of the muscles under the weight of the poured female breast. The breast droops a lot and loses its attractiveness. Many mistakes made during feeding lead to breast deformities.

Use creams and oils

Lubricating the breast skin with special stretch mark creams will help maintain elasticity and reduce the risk of stretch marks. Increases skin elasticity and maintains its hydration and structural integrity. This is especially true for owners of initially large breasts. Essential oils work great. They are best applied after a shower. The most effective are cocoa butter, coconut, and jojoba.

Supportive bra

It is better to immediately change your underwear as soon as you notice that your breasts are growing. The bra should be comfortable, without unnecessary inserts and tight cups. It is better to give preference to sports models with wide straps. Ideal if there are no seams or underwear and is specially designed for pregnant women.

It is recommended to sleep in a night bust, which will eliminate pain. Wearing the right bra will help your breasts stretch less.

Avoid active sports

Active sports can cause a lot of pain with an increase in breast size. It can also be traumatic and dangerous for the fetus in addition to the pain from stretching the breast. Limit exercise to walking, yoga, swimming, and similar activities. Stretching exercises will help maintain skin elasticity and reduce tension.

Why Breast Growth Occurs in Pregnancy?

Structural transformations of the mammary glands during gestation are caused by running mechanisms for maintaining pregnancy and further feeding the baby.

The development of the alveoli and milk ducts begins in the first weeks of pregnancy. Increases blood flow to the mammary glands. They harden and swell. The process of intensive growth of lactogenic tissues starts at about 6-8 weeks. Right now the bust is growing in size. Adipose tissue accumulates by the 19th week. The breast grows even more.

Among the hormones responsible for breast growth are called progesterone and estrogen. Also, the main role is assigned to chorionic somatomammotropin. Prolactin rises with gestation. It is a lactogenic hormone that increases the secretion of colostrum, its maturation, and conversion into milk. Prolactin stimulates the growth of the mammary glands, increasing the number of lobules and ducts in them.

What to do when the breast is very enlarged

Some women experience too much breast enlargement during pregnancy. It brings a lot of inconveniences. It is inconvenient for a pregnant woman to move, sleep, and wear familiar clothes. This provokes the appearance of irritability and negativism towards their position. Use our recommendations to help you with strong breast augmentation:

Change your underwear in time

Don’t skimp on your health. Change your bra on time. This will eliminate most of the problems with the breast during its active growth. You may have to change more than one size during the gestation period, but this is much more expedient than dealing with the problems that have arisen later. Use underwear only from natural materials, without large seams, foam rubber, and thin straps.

Get Tested

It is desirable to do this before conception. It is better to get tested for hormones if you are already pregnant and your breasts are growing too fast. This will show the problem from the inside. A qualified doctor will help you understand the causes of strong growth and prescribe therapy. You need to undergo a visual examination and feel the breast for the presence of tumors and seals.

Reduce activity

It is better to make adjustments to your lifestyle if the breasts become very large and heavy. Eliminate shaking and unnecessary movements of the upper body. It is strictly forbidden to carry and lift weights. Prefer walking over running. Sleep on your side with a pillow under your breast and legs. Evenly distributing weight will help reduce pressure on the back and breast tissue.


A serious signal for contacting a doctor is the detection of seals in the breast. You can feel them yourself or notice them during a gynecological examination. The reason for contacting the doctor may be the presence of discharge from the nipple with a pungent odor, blood, or other impurities.

There should be no serious visual defects on the breast: hematomas, eczema, and other ulcers. The norm is a change in the color of the nipple, stretch marks, and age spots.

What Not to Do

If the breast began to grow actively, you should not immediately look for some kind of negative in this. This is a completely normal natural phenomenon. This symptom does not pose any threat to the mother or child. It is due only to prepare for future lactation. Do not make mistakes from the very beginning of pregnancy. This will save you a lot of problems in the future. What not to do with breast growth:

Don’t massage your breasts

Massage is prohibited during pregnancy, especially in the breast area. Do not rub your breasts vigorously when showering and applying skin care products. Use only a soft towel.

Do not wear tight clothing

Squeezing the mammary glands disrupts blood circulation in the tissues. This impairs the functioning of the ducts and provokes the appearance of neoplasms. Wear loose-fitting clothing made from natural materials.

Do not injure the breast

Try to avoid situations in which you can get mechanical damage to the breast. Be careful at home, with children, and on public transport. Trauma can lead to the appearance of a tumor.

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