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'''Thelarche''' is when female humans develop full breasts. It happens from about 9-15 years of age today, although in the past it began at age 12. This usually begins when girls are about 9<ref>Olson, Ginny Teenage Girls: Exploring Issues Adolescent Girls Face and Strategies to help them https://books.google.com/books?id=miQ5iJnXDKkC&pg=PT30&dq=girls+breasts+start+growing+10+years&hl=en&sa=X&ei=YhDgVKffF4qmyAT6q4CgDQ&ved=0CB0Q6AEwAA#v=onepage&q&f=false</ref>. A lump that is a bit hard appears in each breast under the areola, which is the dark ring around the nipple. The lump in one breast may grow before the other one.<ref name="Marshall 187">Marshall, ''Human Growth'', p. 187.</ref> This is called breast budding.<ref name="Byers 27">{{cite book|author=Anne Byers|chapter=How do Girls' Bodies Change during Puberty?|title=Frequently Asked Questions about Puberty|location=New York, N.Y.|publisher=Rosen Publishing|year=2007|pages=26–33 at 27|isbn=978-1-4042-0966-4}}.</ref> Within 6-12 months, both breasts will have started growing. The swelling can be felt and seen outside the edges of the areolae. About 1 and a half to 2 years after the breasts first start growing, they are close to the shape and size of an adult woman's breasts. The nipple and areola may be on a smaller mound on each breast. This small mound usually goes away when each breast is fully grown.<ref name="Marshall 188">Marshall, ''Human Growth'', p. 188.</ref> Breast size depends on the body's amount of fat.<ref name="Byers 27"/><ref>See also {{cite web|title=Normal breast development|url=http://www.007b.com/breast_development.php|publisher=007 Breasts|accessdate=2 May 2010}}</ref>

'''Thelarche''' is when female humans develop full breasts. It happens from about 9-15 years of age today, although in the past it began at age 12. This usually begins when girls are about 9<ref>Olson, Ginny Teenage Girls: Exploring Issues Adolescent Girls Face and Strategies to help them https://books.google.com/books?id=miQ5iJnXDKkC&pg=PT30&dq=girls+breasts+start+growing+10+years&hl=en&sa=X&ei=YhDgVKffF4qmyAT6q4CgDQ&ved=0CB0Q6AEwAA#v=onepage&q&f=false</ref>. A lump that is a bit hard appears in each breast under the areola, which is the dark ring around the nipple. The lump in one breast may grow before the other one.<ref name="Marshall 187">Marshall, ''Human Growth'', p. 187.</ref> This is called breast budding.<ref name="Byers 27">{{cite book|author=Anne Byers|chapter=How do Girls' Bodies Change during Puberty?|title=Frequently Asked Questions about Puberty|location=New York, N.Y.|publisher=Rosen Publishing|year=2007|pages=26–33 at 27|isbn=978-1-4042-0966-4}}.</ref> Within 6-12 months, both breasts will have started growing. The swelling can be felt and seen outside the edges of the areolae. About 1 and a half to 2 years after the breasts first start growing, they are close to the shape and size of an adult woman's breasts. The nipple and areola may be on a smaller mound on each breast. This small mound usually goes away when each breast is fully grown.<ref name="Marshall 188">Marshall, ''Human Growth'', p. 188.</ref> Breast size depends on the body's amount of fat.<ref name="Byers 27"/><ref>See also {{cite web|title=Normal breast development|url=http://www.007b.com/breast_development.php|publisher=007 Breasts|accessdate=2 May 2010}}</ref>