- Breast Health Online
 - Community forum for breast cancer, augmentation, reduction, and feeding issues. Also includes information on breast reconstruction and revision after a mastectomy. - Breast Questions
- Questions and answers about development and health concerns.
- Breastnotes.com
- Information on breast development and growth patterns, function and purpose, and role in various societies.
- Breasts Through The Ages
- A short history of breasts.
- Breasts, Tits, or Jugs? A Primer
- Features a discussion of popular terminology for female breasts.
- Breasts: An Owner's Manual
- An owner's manual for new breast owners, from Nu-Woman Transgender Cabaret. Includes information on bra sizes, cancer risks, and mammograms.
- Community Breast Health Project
- Acts as a clearinghouse for information and support on breast cancer and other breast health issues.
- Gray's Anatomy: The Mammę
- Description and anatomy of the mammary glands with illustrations.
- OBGYN.net: Breast Health Forum
- FAQs on various topics related to breast development and health including breast size, shape, appearance, and changes in breasts due to hormones, pregnancy, breastfeeding, and birth control..
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