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Yes, it is entirely normal for one breast to start budding first. The other breast will usually start developing within several months and both breasts will typically catch up with equal development within two years. Keep in mind that 25% of women will have a noticeable difference in the size of their breasts (asymmetry) even after breast growth is completed.
In very rare cases, there is a congenital condition where one breast will not develop due to absence of breast tissue (amastia). If you have questions about breast development, don't hesitate to ask your health care provider about it at your next checkup.
You're not alone. Take a look at a few of the questions related to this topic that other teens have asked us.
I know it’s normal for your breasts to be two different sizes, however, is something wrong if one is a size C and the other hasn’t developed?
I'm 18 and my nipples haven't popped out yet. My period started when I was 13. Shouldn't my breasts be developed by now?
I am 14 years old and my breasts haven’t grown. My mother is worried. Should I be?
For more information, check out these articles:
How To Examine Your Breasts
Breast Development in Females
Growing Up as a Girl
Posted 10-12-09
Do you have a question?  As a reminder, this information should not be relied on as medical advice and is not intended to replace the advice of your doctor. Please read our full  .
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