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Faith Hartley and her two girls, Aspen, left, and Bardot, who was conceived using in vitro fertilization (IVF) to guarantee her gender, at home in Encino, Calif., March 9, 2024. Many doctors are seeing more couples, who are well aware of the challenges of conceiving and carrying a healthy baby to full term, skip sex, and go straight to IVF. (Daniel Dorsa/The New York Times/Fotoarena)
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