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No one is sure what is causing the change
Child development - Wikipedia
Menarche - Wikipedia
Normal and Abnormal Growth and Pubertal Development
United States: fertility rate 1800-2020
Onset of puberty in girls has fallen by five years since 1920
Young girls are starting to undergo puberty as young as six years
What are the full consequences of premature puberty in a 3-year
Hair Loss in Teenage Girls - Does Puberty Cause Hair Loss
Adjusted height velocity by age profiles by birth decade for
TMHS 638: Early Onset Puberty Is Surging In Children - The Model
What Does It Mean to Die?
With puberty starting earlier than ever, doctors urge greater
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Fertility: Fewer children, older moms
Did your child hit early puberty? Stop believing these 5 myths