Breast Development in Young Girls: When to Seek Help - Pediatrics

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Breast development


Hello, I have a question.
My daughter is 10 years old, 140 cm tall, and weighs 25 kg.
Today I found a hard lump in her left breast, which hurts when touched.
Is this normal breast development? She had a similar situation at 9 years old, and I took her to a pediatrician.
Some said it was part of development and not a concern, while others said it was too early for development.
Eventually, it disappeared on its own.
Now this situation has occurred again.
I would like to know at what age normal development typically occurs, and if there are any related websites.
Thank you, a worried mom.

wls4772, 10~19 year old female. Ask Date: 2002/02/21

Dr. Zheng Peian reply Pediatrics


At 10 years old, with a height of 140 cm and a weight of 25 kg (10-25 percentile), although still within the normal range, it is important to utilize growth charts and record measurements every 2-3 months to assess whether growth velocity is normal.
Sexual development typically begins between the ages of 9 and 10, with signs such as breast budding, breast enlargement, the appearance of pubic hair, and development of external and internal genitalia, as well as the onset of menstruation.
To confirm whether sexual development has commenced, a consultation with a pediatric endocrinologist may be necessary for evaluations such as blood tests and urinalysis.

Reply Date: 2002/02/21

More Info


Breast development in young girls is a natural part of puberty, which typically begins between the ages of 8 and 13. However, the onset and progression of breast development can vary significantly among individuals. In your case, your daughter is 10 years old and has experienced some discomfort and the presence of a hard lump in her left breast, which raises concerns about whether this is a normal part of her development.

It is important to understand that during puberty, hormonal changes can lead to various physical changes, including breast tissue development. The presence of a lump or discomfort in the breast can sometimes be attributed to normal breast tissue growth, which can be lumpy and tender as it develops. This is often referred to as "breast budding," which is a common occurrence in young girls as they enter puberty.

However, it is also crucial to monitor any changes in breast tissue closely. If the lump persists, grows, or is accompanied by other symptoms such as significant pain, redness, or discharge, it is advisable to seek further evaluation from a healthcare professional. A pediatrician or a pediatric endocrinologist can provide a thorough examination and may recommend imaging studies, such as an ultrasound, to assess the lump more accurately.

In terms of normal breast development, the Tanner stages of sexual maturity outline the typical progression of breast development in girls. Stage 1 is prepubertal, with no breast tissue, while Stage 2 marks the beginning of breast budding, usually occurring between ages 8 and 13. By age 14, most girls have reached Stage 3 or 4, where breast tissue continues to develop and mature. It is essential to remember that every girl develops at her own pace, and variations are normal.

As for resources, the American Academy of Pediatrics (AAP) and the American College of Obstetricians and Gynecologists (ACOG) provide valuable information on puberty and breast development. Websites like HealthyChildren.org and ACOG's patient education pages can offer insights into what to expect during this developmental stage.

In summary, while the presence of a hard lump and discomfort in your daughter's breast may be a normal part of her development, it is essential to monitor the situation closely. If you have any concerns or if the symptoms persist, do not hesitate to consult a healthcare provider for a comprehensive evaluation. Early intervention can help address any potential issues and provide peace of mind for both you and your daughter as she navigates this important developmental phase.

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