Breast - nonmalignant
Neonatal breast

Topic Completed: 1 May 2014

Revised: 10 January 2019

Copyright: (c) 2002-2019,, Inc.

PubMed Search: Neonatal breast [title]

Belinda Lategan, M.D.
Page views in 2018: 74
Page views in 2019 to date: 66
Cite this page: Lategan B Neonatal breast. website. Accessed August 25th, 2019.
Definition / general
  • Identical in males and females at birth
  • Nipple is small pit in center of thickened areola, becomes everted shortly after birth due to proliferation of mesenchyme underlying the areola
  • Breast enlargement (uni or bilateral) is present in up to 70% of neonates due to neonatal prolactin production, caused by falling levels of maternal estrogens; associated with production of "witch's milk" in males and females
  • Continued breast stimulation (squeezing or massaging breasts) may cause hypersecretory state to persist
  • Milk secretion: resembles colostrum; contains water, fat and cellular debris
Microscopic (histologic) description
  • Duct dilation without acini
Microscopic (histologic) images

AFIP: neonatal breast ectasia with dilation of mammary ducts

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