What it means
Breast development has five recognised stages. In the first, the area around the nipple lifts slightly and may become tender. In the second, a small firm lump of breast tissue — the “bud” — appears under the nipple, usually on both sides. From there it grows over two to five years, with the areola darkening and enlarging, the breast developing its own shape, and eventually some softening.
Tender lumps in the early stage are expected and usually settle within months.
What can vary
- Asymmetry is the norm. One breast is almost always a different size or shape from the other. It may even be a different cup size. This is not a defect and it rarely settles to exact symmetry.
- Timing. It can begin anywhere from about age 8 to 13, and can be gradual or relatively quick.
- Uneven progression. One breast can get going noticeably before the other.
- Flat chests. Plenty of people develop very little breast tissue throughout life, and some do not develop breasts on their own at all. This is a normal variation.
- Pain. Buds are often sore or tender for a while. That is usually short-lived.
Possible explanations
If breast development seems absent, delayed, or suddenly changing, a clinician may consider: it is simply still coming; body composition and genetics; hormonal conditions; or, rarely, prior treatment for cancer or a condition affecting the ovaries. Only an examination and history can distinguish them.
Warning signs
- A lump in the breast that is hard, irregular, fixed, or growing.
- Skin dimpling, redness that does not settle, or discharge from the nipple that is not related to feeding.
- Breast development before age 8.
- A breast lump in someone over 30 — or at any age if it is new and changing.
A new, hard, painless lump should always be checked, even in a teenager. Most turn out to be harmless, and that is only knowable by examining it.
What to do next
If you are in the early stages and nothing is painful, you do not need to do anything at all.
If a lump is new, hard or changing, book an appointment. Say exactly what you noticed and how long it has been there.
If you are not sure whether what you feel is normal development, that is a reasonable question for a doctor or nurse.
Self-care
- Wear a bra that fits. A badly fitting bra is uncomfortable and does not slow development; an uncomfortable bra is not a rite of passage. Get properly fitted if you can.
- Nothing makes breasts bigger or smaller except your own genetics, body fat and overall health. No cream, food, supplement or exercise changes them permanently.
- Examine gently, not constantly. Feeling your breasts regularly is reasonable. Pressing hard and squeezing repeatedly causes tenderness and anxiety without improving detection.
- Skip the padded products if they are not for you. They are a choice, and there is no age or size at which you are required to make it.
When to seek help
Routine: “is this normal, and when should I get checked?”
Prompt: any new, hard, growing or changing lump; any lump at all over 30.
Emergency: not for development itself. Sudden severe pain elsewhere is a different matter — see What’s hurting?.
How to talk about it
“I’ve noticed a small tender lump under my nipple. Is that normal development?”
“My breasts are different sizes. Is that worth checking?”
“I found a lump in my breast and I’m worried.”
That last sentence is one doctors hear regularly and are always happy to examine. You will be taken seriously.
Related articles
Sources
Public sources are linked so you can read the detail rather than take this site’s word for it. None of this has yet been reviewed by a qualified clinician — see how we handle medical review.
References
Where this comes from
Linked so you can check it against a recognised public health source rather than take this site's word for it.
- Puberty and adolescence — American Academy of Pediatrics American Academy of Pediatrics (opens in a new tab)
- The menstrual cycle — RCOG Royal College of Obstetricians and Gynaecologists (opens in a new tab)
These are public sources from recognised health organisations, linked so you can read the detail rather than take this site's word for it. Reading them does not tell you whether any of it applies to you, and none of these articles has yet been reviewed by a qualified clinician. How we handle sourcing and review.