Editing Breast (section)

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While it is a common belief that breastfeeding causes [[Ptosis (breasts)|breasts to sag]],<ref name="lauersen">{{cite book |last = Lauersen |first = Niels H. |title = The Complete Book of Breast Care |year = 1998 |publisher = Fawcett Columbine/Ballantine |location = New York |isbn = 978-0-449-91241-6 |edition = 1st Trade Paperback |author2 = Stukane, Eileen |quote = ...there is no medical reason to wear a bra, so the decision is yours, based on your own personal comfort and aesthetics. Whether you have always worn a bra or always gone braless, age and breastfeeding will naturally cause your breasts to sag. |url = https://archive.org/details/completebookofbr00laue_0 }}</ref> researchers have found that a woman's breasts sag due to four key factors: cigarette smoking, [[gravidity|number of pregnancies]], [[gravity]], and weight loss or gain.<ref name="thompson">{{cite journal |doi = 10.1016/j.asj.2008.07.004 |title = The Effect of Breastfeeding on Breast Aesthetics |year = 2008 |last1 = Rinker |first1 = B |last2 = Veneracion |first2 = M |last3 = Walsh |first3 = C |journal = Aesthetic Surgery Journal |volume = 28 |issue = 5 |pages = 534–7 |pmid = 19083576 |doi-access = free}}
*{{cite news |author=Andrea Thompson |date=2 November 2007 |title=Breastfeeding Does Not Make Breasts Sag, Study Suggests |work=LiveScience |url = http://www.livescience.com/1998-breastfeeding-breasts-sag-study-suggests.html |access-date = 9 May 2015 |archive-url = https://web.archive.org/web/20120703153917/http://www.livescience.com/1998-breastfeeding-breasts-sag-study-suggests.html |archive-date = 3 July 2012 |url-status = live}}</ref> Women sometimes wear bras because they mistakenly believe they prevent breasts from sagging as they get older.<ref name="burn" /> Physicians, lingerie retailers, teenagers, and adult women used to believe that bras were medically required to support breasts. In a 1952 article in ''Parents' Magazine'', Frank H. Crowell erroneously reported that it was important for teen girls to begin wearing bras early. According to Crowell, this would prevent sagging breasts, stretched blood vessels, and poor circulation later on.<ref name="brumberg">{{cite book |url=http://course1.winona.msus.edu/pjohnson/e111/e111f99/brumberg.htm|archive-url=https://web.archive.org/web/20020328155254/http://course1.winona.msus.edu/pjohnson/e111/e111f99/brumberg.htm |isbn=0-679-73529-1 |page=336|title=The Body Project: An Intimate History of American Girls|archive-date=28 March 2002|first=Joan Jacobs |last=Brumberg|year=1998 |publisher=Knopf Doubleday Publishing }}</ref> This belief was based on the false idea that breasts cannot anatomically support themselves.<ref name="burn">{{cite web |title=Don't burn your bra just yet |url=https://www.independent.co.uk/life-style/health-and-families/health-news/dont-burn-your-bra-just-yet-622008.html |website=The Independent |date=22 September 2011 |access-date=8 October 2018 |archive-url=https://web.archive.org/web/20180717232012/https://www.independent.co.uk/life-style/health-and-families/health-news/dont-burn-your-bra-just-yet-622008.html |archive-date=17 July 2018 |url-status=live}}</ref><ref name="007b Breast">{{cite web |url=http://www.007b.com/why_wear_bras.php |title=Female Intelligence Agency: Why Do Women Wear Bras? |publisher=007b Breast |access-date=10 May 2011 |archive-url=https://web.archive.org/web/20110831044824/http://www.007b.com/why_wear_bras.php |archive-date=31 August 2011 |url-status=live}}</ref>

[[Sports bra]]s are sometimes used for cardiovascular exercise, sports bras are designed to secure the breasts closely to the body to prevent movement during high-motion activity such as running. Studies have indicated sports bras which are overly tight may restrict respiratory function.<ref>{{Cite journal |last1=Ocran |first1=Francisca Margarita |last2=Ji |first2=Xiaofen |last3=Zhai |first3=Lina |date=January 2022 |title=A study to evaluate pressure distribution of different sports bras |journal=Journal of Engineered Fibers and Fabrics |language=en |volume=17 |doi=10.1177/15589250221118643 |issn=1558-9250|doi-access=free }}</ref><ref>{{Cite journal |last1=Kipp |first1=Shalaya |last2=Leahy |first2=Michael G. |last3=Sheel |first3=A. William |date=2024-06-01 |title=Sports Bra Restriction on Respiratory Mechanics during Exercise |url=https://pubmed.ncbi.nlm.nih.gov/38350462/ |journal=Medicine and Science in Sports and Exercise |volume=56 |issue=6 |pages=1168–1176 |doi=10.1249/MSS.0000000000003403 |issn=1530-0315 |pmid=38350462}}</ref>