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No one is sure what is causing the change
Timing of puberty in boys and girls: Implications for population
30% of children in foster care identify as LGBTQ. Here's one
Children aren't starting puberty younger, medieval skeletons
Is your daughter entering puberty earlier than you would have expected?
Frontiers Pattern of linear growth and progression of bone
Early Puberty in Girls National Center for Health Research
Age assessment practices: a literature review & annotated - Unicef
PDF) Evidence from Finland and Sweden on the relationship between early-life diseases and lifetime childlessness in men and women
1: Mean number of children by women's year of birth, 1920-1980 (in %)
Did your child hit early puberty? Stop believing these 5 myths
United States: fertility rate 1800-2020
Frontiers Endogenous and Exogenous Estrogen Exposures: How Women's Reproductive Health Can Drive Brain Aging and Inform Alzheimer's Prevention
Forty Years Trends in Timing of Pubertal Growth Spurt in 157,000 Danish School Children
