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.
Could you share a picture of the lump with us?