In this guide15 sections
- Key Points
- How to Get Bigger Breasts: The Short Answer
- Why Are My Breasts Small?
- What Makes Breasts Grow?
- Underdeveloped Breasts: Micromastia, Hypomastia and Tuberous Breasts
- How to Get Bigger Breasts Naturally, Without Surgery
- How to Make Your Breasts Look Bigger Without Surgery
- How to Get Bigger Breasts With Surgery
- How Much Bigger Can Your Breasts Get?
- Implants or Fat Transfer: Which Is Best for Small Breasts?
- Breast Enlargement Recovery: How Long Does It Take?
- How Much Does Breast Enlargement Cost?
- How to Get Bigger Breasts: FAQs
- Getting Bigger Breasts at Centre for Surgery
- References
Key Points
- How to get bigger breasts: the only methods that reliably and permanently increase breast size are surgical, mainly breast augmentation with implants, fat transfer, or a combination of the two.
- Why some breasts are small: breast size is largely inherited. A study of more than 1,000 female twins put the heritability of cup size at 56%. Hormones, body fat and, less often, a medical condition also play a part.
- How to get bigger breasts naturally: exercise, food, massage, creams and pills do not grow breast tissue. Gaining weight can add some size, but unpredictably. A well-fitted bra and good posture change how breasts look, not their size.
- Breast enlargement pills and herbal creams have no published trials showing they work, and some contain hormonally active ingredients with unknown long-term safety.
- Implants give the largest and most predictable increase in one operation. Fat transfer gives a more modest, natural increase, typically half a cup to one and a half cup sizes per session, because around 60% of the transferred fat survives.
- Breast development usually finishes by the late teens or early twenties. Cosmetic breast augmentation in the UK is for adults aged 18 and over.
If you are wondering how to get bigger breasts, how to make your breasts bigger naturally or how to increase breast size without surgery, you will find no shortage of advice: exercises, foods, massage, creams, pills and pumps all promise results. Very little of it is backed by evidence. This guide explains why breasts are the size they are, what makes breasts grow, what non-surgical methods can and cannot do, and how breast augmentation, fat transfer to the breasts and hybrid breast augmentation compare, so you can make an informed decision without wasting time or money.
Small breasts are normal, and wanting larger ones is a personal choice rather than a medical need. At Centre for Surgery in London, our plastic surgeons see the full range of breast size concerns, and the right answer is always the one that suits your anatomy and goals. If you are not sure what size would suit your frame, our guide to ideal breast size based on height and weight is a good place to start.
How to Get Bigger Breasts: The Short Answer
Breast size is mostly set by your genes, hormones and body fat. Once breasts have finished developing, there are three honest answers to how to make your breasts bigger:
- Look bigger: a professionally fitted bra, a padded or plunge style, and good posture change how your breasts look in clothes, immediately and at no risk.
- Get slightly bigger with weight gain: breasts are partly fat, so they often grow when you gain weight, but you cannot choose where the weight goes.
- Get permanently bigger with surgery: implants, fat transfer or both. This is the only reliable way to add a chosen amount of volume.
Everything else sold as a way to grow breast size or boost your breasts, from exercises to creams, either changes appearance for a short time or has no evidence behind it at all.
Why Are My Breasts Small?
Breast size varies enormously between women, and in the great majority of cases small breasts are simply normal variation. Several factors decide where you fall on that range.
Is small breast size genetic?
Breast size is largely inherited, much like height or shoe size. In a study of 1,010 female twins published in Twin Research and Human Genetics ↗, the heritability of bra cup size was 56%. About a third of that genetic effect was shared with the genes that influence body weight, and the rest was specific to breast size[1]. In other words, if the women in your family have smaller breasts, you are more likely to as well, whatever you weigh.
Can hormones cause small breasts?
Oestrogen drives breast development, most of all during puberty, when it stimulates the growth of the milk ducts and the fat around them. Progesterone adds to this later in the menstrual cycle and in pregnancy. Hormonal shifts continue to change breast size through life, which is why breasts can feel fuller before a period and often lose volume after breastfeeding and menopause.
Does body fat affect breast size?
Much of the breast is fat, so women with a lower body fat percentage, including many athletes and naturally slim women, tend to have smaller breasts. How large breasts look also depends on your frame: the same volume looks smaller on a tall, broad chest than on a petite one.
Medical causes of small breasts
Less commonly, a medical or hormonal condition affects breast development. These are covered below, because some of them are treatable.
What Makes Breasts Grow?
What makes breasts grow is hormones, mainly oestrogen, at three main times in life: puberty, pregnancy and, to a lesser extent, the days before a period. Nothing you eat, apply or do helps breast growth in the same way. Breast tissue itself is made of milk glands and ducts, fat and supporting ligaments. There is no muscle in the breast, which is why exercise cannot make it bigger.
When do breasts stop growing?
Breasts usually develop over several years from the start of puberty and have mostly finished growing by the late teens, although some women notice small changes into their early twenties. Our guide on when breasts stop growing explains the stages. If there are no signs of breast development by the age of 13, or periods have not started by 16, it is worth seeing a GP, as this can be a sign of delayed puberty with a treatable cause.
Do breasts grow after 25?
Not through further development, but breast size often changes after 25 because of weight change, hormonal contraception, pregnancy and breastfeeding. Pregnancy typically makes breasts larger for a time; afterwards many women find they are smaller or emptier than before. Our guides to breast changes in pregnancy and how breasts change with age cover this in detail.
Underdeveloped Breasts: Micromastia, Hypomastia and Tuberous Breasts
A small number of women have underdeveloped breasts, also described as breast underdevelopment or undeveloped breasts: breasts that did not develop fully. The medical terms are micromastia or hypomastia, meaning breasts that remain very small after puberty, with little glandular tissue. It can affect one or both breasts. Recognised causes include:
- Hypothyroidism. An underactive thyroid can delay puberty and breast development. It is diagnosed with a blood test and treated with daily thyroid hormone tablets.
- Poland syndrome. A condition present from birth in which the chest muscle and breast on one side are underdeveloped or absent. Reconstruction usually combines implants, fat grafting or a muscle flap[2].
- Turner syndrome and other conditions affecting the ovaries, in which low oestrogen means breasts do not develop without hormone treatment.
- Congenital adrenal hyperplasia and the rare ulnar-mammary syndrome.
- Injury to the developing breast bud in childhood, for example from surgery, burns or radiotherapy.
Tuberous breasts are a related difference in shape: the base of the breast is narrow and the breast looks tube-like or constricted, often with a large, puffy areola. They need a specific correction rather than an implant alone; see our guides to tuberous breasts and tuberous breast correction. When one breast is much smaller than the other, breast asymmetry correction evens them up, and our guide on why one breast is bigger than the other explains what is normal.
How to Get Bigger Breasts Naturally, Without Surgery
If you want to know how to increase breast size naturally, how to grow breasts naturally or how to get bigger breasts without surgery, the honest answer is that no natural method creates new breast tissue in an adult. Here is what each of the commonly promoted methods can and cannot do.
Can exercise make your breasts bigger?
Push-ups, chest presses and chest flies strengthen the pectoral muscles behind the breasts. This can improve posture and make the chest look a little more lifted, but it does not make the breast itself bigger, because breast tissue is fat and gland, not muscle. Heavy training that lowers body fat can even make breasts smaller.
Is there a diet or food for breast growth?
No food has been shown to increase breast size. Soy, fenugreek, fennel, milk and flaxseed are often recommended online because they contain phytoestrogens, plant compounds that weakly mimic oestrogen. Their effect is far too weak to grow breast tissue, and no study has shown that eating them does so.
How to gain weight in your breasts
Breasts are partly fat, so gaining weight often makes them bigger, and losing weight often makes them smaller. How much of the change goes to your breasts is largely decided by your genes, so you cannot target it. Gaining weight purely to increase breast size is not a reliable or healthy approach.
Does massaging your breasts increase their size?
Breast massage, with or without almond, coconut or olive oil, is often claimed to stimulate growth. There is no evidence that it increases breast size. It is harmless, and some people find it relaxing, but it will not change your cup size.
Do breast enlargement pills and creams work?
“Bust enhancing” pills and creams are widely sold, usually containing herbs such as fenugreek, fennel, wild yam, hops, dong quai and saw palmetto. A review in Obstetrics and Gynecology ↗ found no published clinical trials of these products. It warned that several of the herbs are hormonally active, that some products may contain a potent fungal oestrogen, and that they should be discouraged because of the lack of evidence and long-term safety concerns[3]. They are sold as supplements or cosmetics, so they are not tested like medicines. Our guide to breast enlargement pills and creams covers this in full.
Does oestrogen increase breast size?
Some women notice their breasts feel fuller on the combined contraceptive pill or HRT, usually from fluid and a small increase in glandular tissue. The change is modest and varies from person to person. Taking oestrogen (estrogen) for breast growth is not a safe shortcut: oestrogen tablets or creams should never be used to try to enlarge the breasts, because they carry real risks, including blood clots, and should only be taken when prescribed for a medical reason. For trans women prescribed feminising hormones, our guide to MTF breast development on HRT explains what growth to expect.
Do breast pumps make breasts bigger?
Suction devices pull on the breast and cause swelling that disappears within hours. A more demanding version, a vacuum bra worn for 10 to 12 hours a day for ten weeks, was tested in 17 women in a study led by the device’s inventor. Twelve women completed it, and their breasts stayed 55% larger on average after treatment ended[4]. The results have not been widely repeated, the daily wear is very difficult to keep up, and today these devices are mainly used by surgeons to prepare the breast before fat transfer rather than as a treatment on their own.
How to Make Your Breasts Look Bigger Without Surgery
If you want your breasts to look fuller without changing their size, these make the most visible difference:
- A professional bra fitting. Many women wear the wrong size. A correctly fitted band and cup lifts the breasts and improves their shape in clothes.
- Padded, push-up, plunge or gel-filled bras, or removable inserts, add visible volume and cleavage.
- Posture. Standing tall with your shoulders back makes the chest look fuller, and chest and upper back exercises help you hold that posture.
- Clothing. Wrap tops, V-necks, ruffles, horizontal stripes and structured necklines add the look of volume.
Our guide on how to get perky breasts has more practical tips, and our guide to natural alternatives to breast implants looks at the non-implant options in more depth.
How to Get Bigger Breasts With Surgery
At Centre for Surgery, we offer every surgical approach to breast enlargement, so your surgeon can recommend the one that suits your anatomy rather than a single default. All procedures are performed by GMC-registered plastic surgeons at our Baker Street hospital, usually as a day case under TIVA (total intravenous anaesthesia).
Breast augmentation with implants
Breast augmentation with implants is the most effective way to get a significant, predictable increase in breast size in one operation. Implants are placed under the breast tissue or partly under the chest muscle, and the size, shape and profile are matched to your chest width and existing tissue at consultation. We use Silimed implants as standard, and our guide to the most natural-looking breast implants explains how shape, profile and size affect the result. The operation usually takes 60 to 90 minutes.
The benefits go beyond size for many women. In a prospective study of 40 women with hypomastia, satisfaction with their breasts, psychosocial wellbeing and sexual wellbeing all improved significantly within two months of augmentation, measured with the BREAST-Q questionnaire[5]. Implants are not lifetime devices, though. In a 10-year study of one manufacturer’s silicone implants ↗, 81.8% of women who had a cosmetic augmentation still had their original implants after ten years, and 94.2% were satisfied[6]. Our guide on how long breast implants last explains why some women need further surgery.
Fat transfer to the breasts
Fat transfer breast augmentation takes fat from your tummy, flanks or thighs by liposuction, purifies it and injects it into the breasts. The result feels completely natural because it is your own tissue, and you get some contouring where the fat was taken. The trade-off is that not all of the fat survives. A 2026 meta-analysis of 40 studies and 5,684 patients in Aesthetic Surgery Journal ↗ found that about 61% of the transferred volume remained at 12 months, with 93% of patients satisfied, and that the most common complication was small areas of fat necrosis, which can feel like lumps[7]. In practice, that usually means an increase of half a cup to one and a half cup sizes per session, and you need enough spare fat to harvest. Our comparison of breast implants vs fat transfer goes through the differences.
Hybrid (composite) breast augmentation
Hybrid breast augmentation combines a smaller implant with fat transfer around its edges, especially over the cleavage and the upper part of the breast. The implant provides predictable volume, and the fat softens the edges so the result looks less “done”. A systematic review of 382 women who had this as their first augmentation found low complication rates and a reoperation rate of 3.7%, mostly for a top-up of fat[8]. It suits slim women with little breast tissue to cover an implant.
Breast lift with auto-augmentation
Some women who want “bigger” breasts actually want fuller ones, after pregnancy, breastfeeding or weight loss have left the breasts lower and emptier. A breast lift with auto-augmentation reshapes your own tissue to restore upper fullness without an implant. Our guide to sagging breasts after breastfeeding explains when a lift, implants or both are needed, and a mummy makeover combines breast and tummy surgery after children.
Breast augmentation for small breasts
Bigger does not have to mean big, and how to make your breast bigger by a small amount is one of the most common questions at consultation. Many women ask for a subtle increase of one cup size or less, using small implants, fat transfer or both. See our pages on the mini boob job and ballerina breast augmentation.
How Much Bigger Can Your Breasts Get?
This is where expectations most often go wrong, because cup size is not a fixed measure: it depends on the band size and the bra brand. Surgeons plan in volume and in proportion to your chest width instead.
| Option | Typical increase | Main limit |
|---|---|---|
| Implants | One to several cup sizes, chosen at consultation | Chest width and how much your skin can stretch |
| Fat transfer | Half to one and a half cup sizes per session | Spare fat available; some is reabsorbed |
| Hybrid | Similar to implants, with softer edges | As for implants, plus enough fat to graft |
| Lift with auto-augmentation | Fuller shape, no added volume | Only redistributes existing tissue |
If you have a particular size in mind, our guides on breast implant sizes and getting to a C cup explain how implant volume relates to cup size.
Implants or Fat Transfer: Which Is Best for Small Breasts?
- Consider implants if you want a noticeable, predictable increase in one operation and are comfortable with an implant that may need replacing in the future.
- Consider fat transfer if you want a modest, natural increase, have enough fat to spare, and would welcome contouring elsewhere.
- Consider hybrid augmentation if you are slim with little breast tissue and want a meaningful increase that looks soft and natural.
- Consider a lift with auto-augmentation if your main concern is shape and upper fullness rather than size.
A face-to-face consultation, with an honest assessment of your chest, skin, breast tissue and donor fat, is the only reliable way to know which option suits you.
Breast Enlargement Recovery: How Long Does It Take?
Implant and fat transfer procedures are usually day cases, so you go home the same day. Most people take one to two weeks off work. Swelling and bruising settle mostly within two weeks, and strenuous exercise and heavy lifting are avoided for about six weeks. Implants take a few months to drop and soften into their final position, while transferred fat continues to settle for up to six months. Our breast augmentation recovery guide goes week by week, and our guide on whether breast augmentation is painful explains what to expect.
How Much Does Breast Enlargement Cost?
The cost depends on the approach, or combination, that suits you, and is confirmed in writing after your consultation. Our guides to breast augmentation cost and fat transfer breast augmentation cost set out current prices, and finance options are available, subject to status.
How to Get Bigger Breasts: FAQs
Can I increase my breast size in a week?
No. Breast tissue cannot grow on that timescale by any non-surgical method. Any quick change is fluid, a hormonal swing before a period, or the effect of a new bra. Even after surgery, the final result takes weeks to months to settle.
Can a slim woman increase her breast size?
Yes, but not by diet or exercise alone. Implants are often the best option for slim women, sometimes combined with a little fat transfer (a hybrid augmentation) to soften the edges. Fat transfer alone may not be possible if there is not enough fat to harvest.
Can you make your boobs bigger naturally?
Not in any lasting way. Weight gain can add some size and a well-fitted bra changes how your breasts look, but no natural method grows new breast tissue once breasts have finished developing.
What makes your breasts bigger as an adult?
Weight gain, pregnancy and hormonal changes are the main things that make breasts bigger after puberty. You cannot choose where weight goes. Breasts often get bigger with general weight gain, but how much depends on your genes. The only way to add volume to the breasts specifically is surgery, including fat transfer, which moves fat from elsewhere into the breasts.
Why are my breasts getting smaller?
Breasts often get smaller with weight loss, after breastfeeding and around menopause, as fat and glandular tissue reduce. This is common and usually nothing to worry about, but a change in only one breast, a new lump or nipple changes should be checked by your GP.
What is micromastia, and can it be treated?
Micromastia, or hypomastia, means breasts that remained very small after puberty, with little glandular tissue. When there is an underlying hormonal cause, such as an underactive thyroid, treating it is the first step. Otherwise, breast augmentation with implants, fat or both is the usual treatment, and it has been shown to improve satisfaction and wellbeing in women with hypomastia[5].
How old do you have to be to have breast augmentation in the UK?
Cosmetic breast augmentation is for adults aged 18 and over, and most surgeons prefer to wait until breasts have finished developing. Our guide to the best age for breast augmentation explains the considerations.
Is it normal for one breast to be smaller than the other?
Yes. Mild asymmetry is very common. If the difference is large enough to bother you, it can be corrected with an implant or fat on the smaller side, or a combination of procedures.
Getting Bigger Breasts at Centre for Surgery
At Centre for Surgery, breast enlargement with implants, fat transfer or a hybrid approach is performed by GMC-registered plastic surgeons at our Baker Street hospital, usually as a day case under TIVA. Your surgeon will give you an honest, individual assessment of what is realistic for your body, and we recommend a two-week cooling-off period before you decide.
Phone: 020 7993 4849 | Address: 95–97 Baker Street, Marylebone, London W1U 6RN
Contact us to schedule a consultation
References
- Wade TD, Zhu G, Martin NG. Body mass index and breast size in women: same or different genes? Twin Research and Human Genetics 2010;13(5):450–454. doi:10.1375/twin.13.5.450
- Grande PK, Mortell T, Chang AE, et al. Reconstructive techniques for chest and breast deformities in Poland syndrome: an up-to-date systematic review. Journal of Plastic, Reconstructive & Aesthetic Surgery 2025;101:207–215. doi:10.1016/j.bjps.2024.12.008
- Fugh-Berman A. “Bust enhancing” herbal products. Obstetrics and Gynecology 2003;101(6):1345–1349. doi:10.1016/s0029-7844(03)00362-4
- Khouri RK, Schlenz I, Murphy BJ, Baker TJ. Nonsurgical breast enlargement using an external soft-tissue expansion system. Plastic and Reconstructive Surgery 2000;105(7):2500–2512. doi:10.1097/00006534-200006000-00032
- Leite AT, Sabino-Neto M, Resende VCL, et al. Patient-reported outcomes after subpectoral breast augmentation with microtextured or macrotextured implants using the BREAST-Q. Archives of Plastic Surgery 2022;49(3):352–359. doi:10.1055/s-0042-1748649
- Spear SL, Murphy DK; Allergan Silicone Breast Implant U.S. Core Clinical Study Group. Natrelle round silicone breast implants: Core Study results at 10 years. Plastic and Reconstructive Surgery 2014;133(6):1354–1361. doi:10.1097/PRS.0000000000000021
- Gentile P, Sterodimas A. Autologous fat grafting for breast augmentation and breast remodeling: a systematic review and meta-analysis of complications, radiologic outcomes, graft retention, and patient-reported satisfaction. Aesthetic Surgery Journal 2026. doi:10.1093/asj/sjag187
- Salibian AA, Frey JD, Bekisz JM, et al. Fat grafting and breast augmentation: a systematic review of primary composite augmentation. Plastic and Reconstructive Surgery Global Open 2019;7(7):e2340. doi:10.1097/GOX.0000000000002340
