"It's Not Just Housing Costs: The Real Culprit Behind the Plummeting Birth Rate Revealed"

"Smartphones May Substitute for Physical Contact and Face-to-Face Interaction"

A new study has found that the spread of smartphones is one of the factors behind the sharp decline in birth rates in the United States.

On June 12 (local time), CNN reported, citing a recent report by researchers from Middlebury College and the National Bureau of Economic Research (NBER), that 2007 was a major turning point for U.S. birth rates. The end of 2007, when the global financial crisis began, was only a few months after Apple launched the first iPhone in the United States.

In the United States, the general fertility rate—which measures the number of births per 1,000 women of childbearing age—has fallen by about 22% from 2007 to the present. The research team noted that this decline is not easily explained by economic conditions, contraceptive use, or costs related to housing and childcare. Therefore, the researchers compared birth rate trends in regions where AT&T's mobile broadband network was quickly established with those where it was rolled out later, in order to evaluate the potential impact of widespread smartphone use. This is because, in the early years after the iPhone was released (2007–2011), it could only be activated on AT&T's network.

As a result, regions where over 90% of residents initially had access to the iPhone saw a significantly greater drop in birth rates compared to areas where network coverage was less than 10%.

This difference was especially pronounced among teenagers and people in their twenties. The birth rate among women aged 15–19 fell by 26% in areas with high smartphone penetration, compared to a 14% decline in areas with low penetration. For women in their twenties, birth rates dropped by 15% in high-penetration regions and 10% in low-penetration regions. Among women in their thirties, birth rates also decreased slightly in areas with high smartphone penetration, but actually increased in areas with less penetration. Overall, the researchers estimated that the initial spread of smartphones accounted for 33–52% of the total decline in the U.S. general fertility rate between 2007 and 2011.

The research team suggested that smartphones may have served as a substitute for physical contact and face-to-face interaction. In fact, according to national survey data cited in the study, the iPhone led to a reduction in face-to-face interactions, an increase in online pornography consumption, and a decrease in the frequency of sexual activity.

However, the researchers emphasized, "Smartphones are not the only cause of the decline in the U.S. birth rate," but added, "They are nonetheless one of the important contributing factors."

Caitlin Myers, the lead author of the report and an economist, explained, "This research is significant for policy because there is concern that we may not fully understand why birth rates are falling or may be looking in the wrong places. The answer for policymakers may lie in how to promote human face-to-face interaction in the future."

Another study, which analyzed changes in smartphone penetration and teenage birth rates in 128 countries based on World Bank data, found that birth rate changes occurred in similar periods across countries, even though each country differed in healthcare systems, welfare policies, religion, abortion laws, and economic conditions. For this reason, the researchers suggested that smartphones—spread almost simultaneously around the world—can be considered one of the common factors.

This content was produced with the assistance of AI translation services.