Thelarche is the onset of secondary breast development between 8-13 years
Breast development occurs during fetal development
Menarche typically follows about two years after thelarche
Complete breast development takes 2-4 years, up to age 18
Hormonal Factors
Estrogen causes breast adipose tissue growth
Progesterone develops mammary glands and areolae
Hormonal changes cause breast development to be asymmetrical
Trends and Variations
Age of thelarche has decreased 0.24 years per decade since 1973
African American females average 8.9-9.5 years, Caucasians 10-10.4 years
Premature thelarche occurs before age 8 without pubertal changes
14-18% of premature thelarche cases also have precocious puberty
Premature Thelarche Characteristics
Usually occurs between 0-2 years of age
Breast development begins as firm disc-like area under areola
Usually resolves within 6 months to 6 years
No treatment required unless accompanied by other symptoms
Yanıtı değerlendir
{"ikun0":{"state":{"logoProps":{"url":"https://yandex.com.tr"},"formProps":{"action":"https://yandex.com.tr/search","searchLabel":"Bul"},"services":{"activeItemId":"summary","items":[{"url":"https://yandex.com.tr/gundem/","title":"Gündem","id":"agenda"},{"url":"https://yandex.com.tr/shopping/","title":"Alışveriş","id":"shopping"},{"url":"https://yandex.com.tr/finance/","title":"Finans","id":"finance"},{"url":"https://yandex.com.tr/yacevap/","title":"YaCevap","id":"answers"},{"url":"https://yandex.com.tr/yaozet/","title":"YaÖzet","id":"summary"},{"url":"https://yandex.com.tr/travel/","title":"Seyahat","id":"travel"},{"url":"https://yandex.com.tr/video/search?text=popüler+videolar","title":"Video","id":"video"},{"url":"https://yandex.com.tr/gorsel/","title":"Görsel","id":"images"}]},"userProps":{"loggedIn":false,"ariaLabel":"Menü","plus":false,"birthdayHat":false,"child":false,"dialogProps":{"host":"yandex.com.tr","lang":"tr","project":"summary","queryParams":{"exp_flags":"skin","preset":"oceania","utm_source":"portal-summary"},"retpath":"https%3A%2F%2Fyandex.com.tr%2Fyaozet%2Fmedicine%2Fthelarche-and-breast-development-id1-nn71RxyP%3Flr%3D213%26ncrnd%3D66894","tld":"com.tr","platform":"desktop"},"className":"PortalHeader-User"},"suggestProps":{"selectors":{"form":".HeaderForm","input":".HeaderForm-Input","submit":".HeaderForm-Submit","clear":".HeaderForm-Clear","layout":".HeaderForm-InputWrapper"},"suggestUrl":"https://yandex.com.tr/suggest/suggest-ya.cgi?show_experiment=222&show_experiment=224","deleteUrl":"https://yandex.com.tr/suggest-delete-text?srv=web&text_to_delete=","suggestPlaceholder":"Yapay zeka ile bul","platform":"desktop","hideKeyboardOnScroll":false,"additionalFormClasses":["mini-suggest_theme_tile","mini-suggest_overlay_tile","mini-suggest_expanding_yes","mini-suggest_prevent-empty_yes","mini-suggest_type-icon_yes","mini-suggest_personal_yes","mini-suggest_type-icon_yes","mini-suggest_rich_yes","mini-suggest_overlay_dark","mini-suggest_large_yes","mini-suggest_copy-fact_yes","mini-suggest_clipboard_yes","mini-suggest_turboapp_yes","mini-suggest_expanding_yes","mini-suggest_affix_yes","mini-suggest_carousel_yes","mini-suggest_traffic_yes","mini-suggest_re-request_yes","mini-suggest_source_yes","mini-suggest_favicon_yes","mini-suggest_more","mini-suggest_long-fact_yes","mini-suggest_hide-keyboard_yes","mini-suggest_clear-on-submit_yes","mini-suggest_focus-on-change_yes","mini-suggest_short-fact_yes","mini-suggest_app_yes","mini-suggest_grouping_yes","mini-suggest_entity-suggest_yes","mini-suggest_redesigned-navs_yes","mini-suggest_title-multiline_yes","mini-suggest_type-icon-wrapped_yes","mini-suggest_fulltext-highlight_yes","mini-suggest_fulltext-insert_yes","mini-suggest_lines_multi"],"counter":{"service":"summary_com_tr_desktop","url":"//yandex.ru/clck/jclck","timeout":300,"params":{"dtype":"stred","pid":"0","cid":"2873"}},"noSubmit":false,"formAction":"https://yandex.com.tr/search","tld":"com.tr","suggestParams":{"srv":"serp_com_tr_desktop","wiz":"TrWth","yu":"9609102331761021085","lr":213,"uil":"tr","fact":1,"v":4,"use_verified":1,"safeclick":1,"skip_clickdaemon_host":1,"rich_nav":1,"verified_nav":1,"rich_phone":1,"use_favicon":1,"nav_favicon":1,"mt_wizard":1,"history":1,"nav_text":1,"maybe_ads":1,"icon":1,"hl":1,"n":10,"portal":1,"platform":"desktop","mob":0,"extend_fw":1,"suggest_entity_desktop":"1","entity_enrichment":"1","entity_max_count":"5"},"disableWebSuggest":false},"context":{"query":"","reqid":"1761021157072183-1128906476425088972-balancer-l7leveler-kubr-yp-vla-86-BAL","lr":"213","aliceDeeplink":"{\"text\":\"\"}"},"baobab":{"parentNode":{"context":{"genInfo":{"prefix":"ikunw01-0-1"},"ui":"desktop","service":"summary","fast":{"name":"summary","subtype":"header_tr"}}}}},"type":"summary","subtype":"header_tr"},"ikun1":{"state":{"links":[{"id":"0","title":"Ana Sayfa","url":"/yaozet/","target":"_self"},{"id":"1","title":"Talimatlar","url":"/yaozet/how_to","target":"_self"},{"id":"2","title":"Eğitim","url":"/yaozet/education","target":"_self"},{"id":"3","title":"Tıp","url":"/yaozet/medicine","target":"_self"},{"id":"4","title":"Yasalar","url":"/yaozet/law","target":"_self"},{"id":"5","title":"Finans","url":"/yaozet/finance","target":"_self"},{"id":"6","title":"Oyunlar","url":"/yaozet/games","target":"_self"},{"id":"7","title":"Ürünler","url":"/yaozet/ecom","target":"_self"},{"id":"8","title":"Seyahat","url":"/yaozet/travel","target":"_self"},{"id":"9","title":"Servisler","url":"/yaozet/services","target":"_self"},{"id":"10","title":"Sinema","url":"/yaozet/cinema","target":"_self"},{"id":"11","title":"Programlama","url":"/yaozet/programming","target":"_self"},{"id":"12","title":"Otomobil","url":"/yaozet/auto","target":"_self"},{"id":"13","title":"Yemek","url":"/yaozet/food","target":"_self"},{"id":"14","title":"Bilim","url":"/yaozet/science","target":"_self"},{"id":"15","title":"Spor","url":"/yaozet/sports","target":"_self"},{"id":"16","title":"Edebiyat","url":"/yaozet/literature","target":"_self"},{"id":"17","title":"Emlak","url":"/yaozet/real_estate","target":"_self"},{"id":"18","title":"Diğer","url":"/yaozet/other","target":"_self"}],"activeLinkId":"3","title":"Kategoriler","baobab":{"parentNode":{"context":{"genInfo":{"prefix":"ikunw02-0-1"},"ui":"desktop","service":"summary","fast":{"name":"summary","subtype":"header_categories"}}}}},"type":"summary","subtype":"header_categories"},"ikun2":{"state":{"article":{"title":"Thelarche and Breast Development","text":"Thelarche is the onset of secondary breast development between 8-13 years. Breast development occurs during fetal development. Menarche typically follows about two years after thelarche. Complete breast development takes 2-4 years, up to age 18","detailed":{"text":"Thelarche is the onset of secondary breast development between 8-13 years. Breast development occurs during fetal development. Menarche typically follows about two years after thelarche. Complete breast development takes 2-4 years, up to age 18","chapters":[{"id":0,"theses":[{"id":0,"link":null,"text":"Thelarche is the onset of secondary breast development between 8-13 years"},{"id":1,"link":null,"text":"Breast development occurs during fetal development"},{"id":2,"link":null,"text":"Menarche typically follows about two years after thelarche"},{"id":3,"link":null,"text":"Complete breast development takes 2-4 years, up to age 18"}],"title":"Normal Development"},{"id":1,"theses":[{"id":0,"link":null,"text":"Estrogen causes breast adipose tissue growth"},{"id":1,"link":null,"text":"Progesterone develops mammary glands and areolae"},{"id":2,"link":null,"text":"Hormonal changes cause breast development to be asymmetrical"}],"title":"Hormonal Factors"},{"id":2,"theses":[{"id":0,"link":null,"text":"Age of thelarche has decreased 0.24 years per decade since 1973"},{"id":1,"link":null,"text":"African American females average 8.9-9.5 years, Caucasians 10-10.4 years"},{"id":2,"link":null,"text":"Premature thelarche occurs before age 8 without pubertal changes"},{"id":3,"link":null,"text":"14-18% of premature thelarche cases also have precocious puberty"}],"title":"Trends and Variations"},{"id":3,"theses":[{"id":0,"link":null,"text":"Usually occurs between 0-2 years of age"},{"id":1,"link":null,"text":"Breast development begins as firm disc-like area under areola"},{"id":2,"link":null,"text":"Usually resolves within 6 months to 6 years"},{"id":3,"link":null,"text":"No treatment required unless accompanied by other symptoms"}],"title":"Premature Thelarche Characteristics"}],"keypoints":null},"type":"text","categoryId":"medicine","url":"https://en.wikipedia.org/wiki/Thelarche","urlProcessed":"https://yandex.com.tr/yaozet/medicine/thelarche-and-breast-development-id1-nn71RxyP/medicine/thelarche-and-breast-development-id1-nn71RxyP","pageUrl":"https://yandex.com.tr/yaozet/medicine/thelarche-and-breast-development-id1-nn71RxyP?lr=213","sharingPath":"medicine/thelarche-and-breast-development-id1-nn71RxyP"},"pageUrl":"https://yandex.com.tr/yaozet/medicine/thelarche-and-breast-development-id1-nn71RxyP?lr=213","header":{"title":"Thelarche and Breast Development","subtitle":"Yapay zekadan makale özeti","homeUrl":"/yaozet/","sourceUrl":"https://en.wikipedia.org/wiki/Thelarche","hasShare":true,"canUseNativeShare":false,"extralinksItems":[{"variant":"reportFeedback","reportFeedback":{"feature":"YaOzet","title":"Bu yanıtta yanlış olan nedir?","checkBoxLabels":[{"value":"Uygunsuz veya aşağılayıcı yanıt"},{"value":"Bilgi az"},{"value":"Bilgi güncel değil"},{"value":"Görüntüleme hataları"},{"value":"Diğer"}]}}],"categoryUrl":"/yaozet/medicine","categoryTitle":"Tıp"},"feedbackProps":{"feature":"Summary","baseProps":{"metaFields":{"userAgent":"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)","userTestids":"","reqid":"1761021157072183-1128906476425088972-balancer-l7leveler-kubr-yp-vla-86-BAL","userRegionName":"Columbus","userRegionId":"20815","userCountryName":"Russia","yandexuid":"9609102331761021085","uid":"0","isChildAccount":false,"pageUrl":"https://yandex.com.tr/yaozet/medicine/thelarche-and-breast-development-id1-nn71RxyP?lr=213"}},"positiveCheckboxLabels":[{"value":"Yanıtı çok beğendim"},{"value":"Yanıtta gerekli bilgiler var"},{"value":"Kolay anlaşılır"},{"value":"Diğer"}],"negativeCheckboxLabels":[{"value":"Uygunsuz veya aşağılayıcı yanıt"},{"value":"Bilgi az"},{"value":"Bilgi güncel değil"},{"value":"Görüntüleme hataları"},{"value":"Diğer"}]},"isHermione":false,"dialogStoreProps":{"baseUrl":""},"globalStoreProps":{"imageBackendUrl":"https://yandex.com.tr/images-apphost/image-download?cbird=171","query":"","retina":false,"avatarId":"0","isMacOS":false,"isEmbeddedFuturis":false,"brand":"yazeka","device":{"isIOS":false,"platform":"desktop"},"neuroMordaUrl":"","advChatParams":{"advLabelProps":{"compactAdvLabel":false},"needPrerenderCounter":false},"disableUrlParamsModification":false,"feedbackBaseProps":{"featureName":"summary","metaFields":{"userAgent":"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)","userTestids":"","reqid":"1761021157072183-1128906476425088972-balancer-l7leveler-kubr-yp-vla-86-BAL","userRegionName":"Columbus","userRegionId":"20815","userCountryName":"Russia","yandexuid":"9609102331761021085","uid":"0","isChildAccount":false,"pageUrl":"https://yandex.com.tr/yaozet/medicine/thelarche-and-breast-development-id1-nn71RxyP?lr=213"}},"adapterName":"summary"},"baobab":{"parentNode":{"context":{"genInfo":{"prefix":"ikunw03-0-1"},"ui":"desktop","service":"summary","fast":{"name":"summary_item_response"}}}}},"type":"summary_item_response"},"ikun3":{"state":{"isIndex":false,"form":{"name":"yaozet","action":"/yaozet/create","validatePath":"/yaozet/create/json"},"baobab":{"parentNode":{"context":{"genInfo":{"prefix":"ikunw04-0-1"},"ui":"desktop","service":"summary","fast":{"name":"summary","subtype":"right-column"}}}}},"type":"summary","subtype":"right-column"},"ikun4":{"state":{"generalLinks":[{"id":"privacy-policy","text":"Gizlilik politikası","url":"https://yandex.com.tr/legal/privacy_policy/tr/"},{"id":"terms-of-service","text":"Kullanıcı sözleşmesi","url":"https://yandex.com.tr/legal/yaozet_termsofuse"},{"id":"report-error","text":"Hata bildir","url":"https://forms.yandex.com.tr/surveys/13748122.01a6645a1ef15703c9b82a7b6c521932ddc0e3f7/"},{"id":"about-company","text":"Şirket hakkında","url":"https://yandex.com.tr/project/portal/contacts/"}],"copyright":{"url":"https://yandex.com.tr","currentYear":2025},"socialLinks":[{"url":"https://www.tiktok.com/@yandex.turkiye","type":"tiktok","title":"TikTok"},{"url":"https://www.youtube.com/@YandexTurkiye","type":"youtube","title":"Youtube"},{"url":"https://www.facebook.com/YandexComTr","type":"facebook","title":"Facebook"},{"url":"https://www.instagram.com/yandex__turkiye/","type":"instagram","title":"Instagram"},{"url":"https://x.com/yndxturkiye","type":"x","title":"X"}],"categoriesLink":[],"baobab":{"parentNode":{"context":{"genInfo":{"prefix":"ikunw05-0-1"},"ui":"desktop","service":"summary","fast":{"name":"summary","subtype":"footer_tr"}}}}},"type":"summary","subtype":"footer_tr"}}