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US Fertility Rate Falls To All-Time Low

著者: BeauHD
2026年4月10日 12:30

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米国の出生率が歴史的な低位に達しました。CDC(疾病管理と予防局)の初期データによると、2007年から昨年にかけて、アメリカ女性の出産数は約71万人減りました。この下降トレンドは23%で、特に若い女性や少女からの出生率が大幅に低下しています。

経済要因や文化的影響、女性の教育と避妊方法へのアクセス改善などが原因として挙げられています。しかし、将来これらの女性たちが子供を持つかどうかは未定です。マラサバ・ベイリー経済学者( UCLAカリフォルニア人口研究センター所長)は「人々は望む数の子供を選び、自己の経済的な状況に適したタイミングで出産しています」と述べています。

また、未成年者の妊娠率が7%減少したことについて、ビアンカ・アリソン医師(ノースカロライナ大学医学部准教授)は「これは避妊方法の使用率の向上と若者の性的行動の低下の結果であり、人工中絶へのアクセス継続も影響しています」と述べています。
An anonymous reader quotes a report from NPR: Women in the U.S. gave birth to roughly 710,000 fewer children last year compared with the nation's peak in 2007, according to preliminary data released (PDF) this week by the Centers for Disease Control and Prevention. Lead researcher Brady Hamilton, a demographer with the CDC's National Center for Health Statistics, said the latest one percent drop in "general fertility" from 2024 to 2025 is part of a long-running downward trend. "Since 2007, there's been a decline in the general fertility rate [in the U.S.] of 23%," Hamilton told NPR. The impact of that change in real numbers is sizable: In 2007, there were 4,316,233 babies born. Last year, even though the nation's population as a whole is larger, there were only 3,606,400 newborns. There's no consensus over why women and couples have shifted their behavior so significantly. Some experts point to economic factors, others say cultural influences, and better access to education and contraception for women are driving the change. "We're seeing big drops in fertility rates for young women, teenagers and women in their 20s," said economist Martha Bailey, head of the California Center for Population Research at the University of California, Los Angeles. "What's not yet clear is whether or not those same women will go on to have children later on." "People are having the number of children they want and that they can afford at a time that makes the most sense for them," she said. "What I don't think anyone is in favor of is a Handmaid's Tale type policy regime, where we're trying to talk families into having children they don't want." One silver lining in the data is the 7% decline in teen pregnancies in 2025. Bianca Allison, pediatrician and associate professor at the University of North Carolina School of Medicine, said: "What is actually affecting the birth rates are likely lower rates of teen pregnancy overall, which is in the context of higher use of contraception and lower sexual activity for youth, and then also continued access to abortion care."

Read more of this story at Slashdot.

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