Experts think that there is probably a shift in attitudes occurring, where women are choosing to delay having children - particularly as assisted reproductive technology is ever improving - or simply deciding to have fewer.
The United States has hit a 40-year-low in its fertility rate, with only about 1.76 births per woman for the 2017 provisional estimate, according to numbers released on Wednesday by the Centers for Disease Control and Prevention.
The 2017 provisional estimate of fertility for the entire USA indicates about 3.85 million births in 2017 and a total fertility rate of about 1.76 births per women.
The CDC said the general fertility rate also fell to a record low of 60 births per 1,000 women between the ages of 15 and 44 - a 3 percent drop. For that same group, the birth rate has fallen by 55 percent since 2007 and by 70 percent since the most recent peak in 1991, the CDC said.
The only age group that saw a rise in birth rates: Women in their early 40s.
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Pre-term babies and low birth weights dropped for the third straight year, and Cesarean deliveries rose slightly. For almost all age groups of women under 40 years there was a decline in birth rates, while an increase was seen among women in their early 40s. One of the most significant is the fact that teen pregnancy is substantially lower than it has been historically. For teenagers aged 15 to 19 years, the birth rate decreased 7 percent in 2017 to 18.8 births per 1,000 women, with decreases in the rates for younger and older teenagers (15 to 17 and 18 to 19, respectively).
Birth rates in the United States are now the lowest they have been for three decades.
"It's hard to say yet whether it marks a fundamental change or it's just a blip, University of Pennsylvania demographer Hans-Peter Kohler told the AP, in reference to the slight decline in birth rates for women in their 30s".
"The rate has generally been below replacement since 1971", according to the report from CDC's National Center for Health Statistics.