I've read that it is common and it's caused by exposure to maternal hormones. It will shrink with time.
Here's the article for your reference:
http://www.webmd.com/parenting/baby/your-newborn-baby-breast-lumps
But I think it would be good to consult a doctor just to be sure.
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Share a picture with us,
And def do bring to see a doctor and do let us know.
So that we would also be prepared if we were to see such things on our daughters.
Hi dear, maybe you can share a picture with us? I suggest for you to consult a doctor to be on the safer side.