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Dr Bader is accurate in noting that nearly 500 000 births occur to adolescent females in the United States annually (most of which are to young women 18 and 19 years of age). According to the statistic that 10% of adolescent females become pregnant, based on annual percentage, when looked at over the span of adolescent years, a teenage female in the United States has a 40% chance of becoming pregnant before her 20th birthday.
Robert W. Blum. Adolescent Pregnancy: Incidence and Cost-Reply. JAMA. 1987;258(14):1890. doi:10.1001/jama.1987.03400140052009