Breast development is often one of the earliest visible signs of puberty in girls. Puberty commonly begins between ages 8 and 13, although every girl develops at her own pace. Doctors commonly describe breast development using five Tanner stages, beginning with the prepubertal stage and progressing through breast budding to mature breast development.
In this guide, we explain the 5 stages of breast development in girls, what breast buds are, what changes may occur during puberty, and how parents can help their daughter choose comfortable innerwear when she feels ready.
Cleveland Clinic notes that most girls begin developing breasts between ages 8 and 13, around the same time puberty starts, and that this process happens in steps known as the Tanner stages.
Why Breast Development Can Feel Unfamiliar At First
As breast buds begin to develop, the nipple and areola may become more noticeable under school uniforms, fitted T-shirts, or dresses.
At this early stage, breast development is gradual, and some girls may become more aware of these changes under their clothes. A regular bra may not always feel like the most comfortable first layer.
Also Read: Starter Camisole vs Starter Bra: Which Is Right For Your Girl?
For some girls, these changes may make them more conscious of how their clothes fit or feel. They may prefer an extra layer for coverage, comfort, or simply because it feels more familiar.
As parents, the goal is to support their comfort and confidence without making them feel rushed into wearing a particular type of innerwear. A camisole or starter bra can be considered based on what feels comfortable for the individual child.
What Is the Tanner Scale?
The Tanner Scale, also called Sexual Maturity Rating, is a five-stage system healthcare professionals use to describe physical development during puberty. In girls, breast development is described from Tanner Stage 1, the prepubertal stage, through Tanner Stage 5, mature breast development. Stage 2, when a breast bud begins developing, generally marks the beginning of pubertal breast development.
Source: NCBI Endotext: Normal and Abnormal Puberty
Breast Development Stages & Comfortable Innerwear Options
Note: Every girl's puberty timeline is different. Tanner stages describe physical development rather than a fixed age. Breast development commonly begins between ages 8 and 13, but both the timing and pace of development can vary.
The 5 Stages Of Breast Development Explained

Stage 1: Prepubertal Stage
This is the prepubertal stage, before breast development begins. There is no glandular breast tissue yet, although the nipple may be slightly raised. A camisole or vest can be worn based on comfort and personal preference.
Source: NCBI Tanner Staging
Stage 2: Breast buds form
During Stage 2, small breast buds begin to develop beneath the nipple and areola. The areola may become larger, and mild tenderness or discomfort can occur as breast development begins. It is also common for one breast to start developing before the other.
Source: NCBI Endotext: Normal and Abnormal Puberty
If she would like additional coverage, she may prefer a soft starter camisole or starter bra. Soft, breathable fabrics such as cotton can feel comfortable during this stage.
Adira’s flat-padded beginner/starter bras and flat-padded starter camisoles can be comfortable options for girls who prefer additional coverage during this stage.
If she isn’t ready for padding, Adira’s non-padded starter bra offers another option. Made from soft cotton-spandex fabric, it has a double-layered front for added coverage, a slip-on design without hooks or wires, and a scoop neck with a U-back for comfortable everyday wear.
Stage 3: Breast and areola enlarge
During Stage 3, the breast and areola continue to enlarge and the breast becomes more prominent. The areola remains part of the overall breast contour rather than forming a separate mound. A starter camisole or starter bra can be chosen depending on the coverage, fit and comfort she prefers. And if she’s not ready for padding just yet, Adira’s non-padded starter bras offer a soft, gentle layer that still provides coverage without the added bulk.
Stage 4: Secondary Areolar Mound Forms
During Tanner Stage 4, the areola and nipple project above the rest of the breast, forming a secondary mound. Breast development continues during this stage. A starter camisole, starter bra or regular bra can be chosen based on fit, coverage, comfort and personal preference.
Source: NCBI Tanner Staging
Stage 5: Mature Breast Contour
During Tanner Stage 5, the breasts reach a mature contour. The secondary areolar mound recedes so the areola follows the contour of the breast, while the nipple remains projected. Innerwear at this stage can be chosen based on individual size, fit, coverage, support and comfort. She may continue with a starter bra or move to a regular bra depending on her preference.
Source: NCBI Endotext – Normal And Abnormal Puberty
Supporting Her Through Puberty Changes
As puberty progresses, girls may have questions or mixed feelings about the changes happening to their bodies. Open and reassuring conversations can help them understand that puberty develops differently for everyone and that these changes are a normal part of growing up.
For an easy-to-understand introduction to puberty, explore Ms P’s Guide for Girls
Preparing For Her First Period
A first period is another important milestone in puberty, and it can happen while breast development is still progressing. The timing is different for every girl, so talking about periods early and helping her stay prepared can make the experience feel more familiar and less stressful.
Keeping a pad in her school bag and pairing it with an Adira Teen Period Panty can provide an extra layer of backup when she is at school or away from home.
Regular Bra vs. Adira Starter Cami During Early Puberty
| Feature / Concern | Regular Bra | Adira Starter Cami |
|---|---|---|
| Fit For Early Puberty |
Fit depends on the bra style, size and stage of development. |
Designed as an easy first layer for growing girls. |
| Padding Type | May be padded or non-padded depending on the style. | Flat padding provides coverage without adding shape. |
| Comfort & Fabric | Comfort varies depending on fabric, seams, wires and construction. | Soft cotton-elastane fabric designed to stretch and move comfortably. |
| Coverage And Style | Mainly covers the breast area. | Midriff-length camisole provides chest and midriff coverage in one layer. |
| Ease Of Wearing | May be slip-on or include hooks and closures. | Slip-on style with no hooks or wires. |
| Fit Adjustment | Depends on the bra design. | Adjustable straps help customize the fit. |
| Best For | Girls who feel comfortable transitioning to a regular bra. | Girls who prefer camisole-style coverage during early breast development. |
| Designed For | Varies by brand and style. | Designed specifically for growing girls during puberty. |
Conclusion
Breast development is a natural part of puberty, and every girl's timeline is different. There is no single age or stage at which she must begin wearing a bra. The right innerwear should be based on her comfort, fit, coverage needs and personal preference.
Adira’s Starter Bras, Starter Camisoles and Non-Padded Starter Bras offer different options as her needs change through puberty. Most importantly, open and reassuring conversations can help make these changes feel easier to understand.
Adira wishes all young girls a happy childhood and a positive journey through puberty.
Frequently Asked Questions
1. Is it normal for one breast to grow faster than the other during puberty?
Yes. It is common for one breast to begin developing before the other or to grow at a different rate. Some difference in breast size can remain even after development is complete.
Source: Cleveland Clinic – Breast Development
2. Is breast tenderness normal when breast buds begin to develop?
Yes. Mild soreness or tenderness can occur when breast buds first begin to develop. Breast buds form beneath the nipple and areola and are often one of the earliest signs of breast development during puberty.
Source: Cleveland Clinic – Breast Development
3. How long does breast development take during puberty?
Breast development happens gradually over several years and the timeline varies from girl to girl. Breast development can continue throughout the teenage years and is usually complete by around age 17, although individual development may finish earlier or later.
Source: Cleveland Clinic – Breast Development
4. Can a girl get her first period before breast development is complete?
Yes. Menstruation can begin while breast development is still progressing. Cleveland Clinic notes that periods commonly begin around two years after breast buds first appear, while breast development can continue through the teenage years.
Source: Cleveland Clinic – Breast Development
5. When should you speak to a doctor about puberty or breast development?
It is a good idea to speak with a healthcare professional if breast development begins before age 8, if there are no signs of breast development by age 13, or if there are other changes that cause concern.
Source: Cleveland Clinic – Breast Development
Disclaimer:
This content is provided for educational and informational purposes only and does not constitute medical advice. Readers should consult a qualified healthcare professional before making health-related decisions.