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… your estrogen levels go up and down unevenly. This causes changes in your period and other symptoms, such as … your estrogen levels go up and down unevenly. This causes changes in your period and other symptoms, such as … your estrogen levels go up and down unevenly. This causes changes in your period and other symptoms, such as …
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… brain development between the ages of 12 and 24 months causes amazing changes to happen—such as talking, walking, … brain development between the ages of 12 and 24 months causes amazing changes to happen—such as talking, walking, …
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