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The early child period is considered to be the most important developmental phase throughout the lifespan.
A little later, hair also will grow under your arms. For most girls, their first menstrual period, or menarche (say: MEH-nar-kee), begins about 2 to 2Â½ years after breast development starts. Some girls may get their period in less than 2 years. For other girls, it may take longer. Every girl is different, and there is a wide range of normal development during puberty.