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Hormones sometimes cause breast growth in male children. This is called gynecomastia. Using some medicines also can cause breast growth. It can also be caused by a medical condition.
In babies, this usually goes away in a few weeks to a year after birth. In preteen and teenage boys, this often goes away within 6 months but may last up to 2 years. Many boys get this breast growth from rapid hormone changes during puberty.
Talk with your doctor if your teen is concerned about breast size or shape or is worried by these changes.
Follow-up care is a key part of your child's treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if your child is having problems. It's also a good idea to know your child's test results and keep a list of the medicines your child takes.
Watch closely for changes in your child's health, and be sure to contact your doctor or nurse advice line if:
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Current as of: February 10, 2021
Author: Healthwise Staff
Medical Review:Adam Husney MD - Family Medicine & Kathleen Romito MD - Family Medicine
Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.
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