Experts reveal link between fertility rates and smartphone use

Smartphone use may be contributing to declining fertility rates, according to new research that links digital habits with reduced in-person interaction, lower sexual activity and increased pornography consumption.

The findings come from economists at Middlebury College in a working paper published by the National Bureau of Economic Research, which examines the long-term decline in birth rates in the United States since the introduction of smartphones in 2007.

Smartphones linked to fertility decline in new study

People reported that researchers say the introduction of smartphones, particularly the iPhone, coincides with a sharp and sustained drop in fertility rates among women aged 15 to 44.

The study suggests that smartphones have reduced face-to-face interactions and reshaped social behaviour, contributing to fewer births among younger women.

It estimates that smartphone adoption may account for around 33% to 52% of the decline in fertility rates in this age group, although researchers note that the impact varies across age cohorts.

Reduced interaction and changing behaviour patterns

The paper argues that increased smartphone use has led to fewer in-person social interactions, lower levels of sexual activity, and a rise in pornography use.

Researchers say these combined behavioural shifts may help explain part of the long-term decline in birth rates observed since the late 2000s.

Caitlin K. Myers, one of the authors, said smartphones appear to be an important factor in the trend, while noting that they do not explain the entire decline.

“It is a really important factor to consider,” she said, adding that a significant portion of the decline remains unexplained.

US fertility rates continue long-term decline

Data from the US Centers for Disease Control and Prevention shows fertility rates among women aged 15 to 44 have fallen by around 23% between 2007 and 2025.

The study notes that the decline has been more pronounced among women under 30, while older age groups show different patterns, including delayed childbirth rather than complete reduction in births.

Financial pressures and delayed parenthood also factors

Researchers also highlight that smartphones are only one of several contributing factors.

Rising financial pressures, housing costs and changing lifestyle choices are also widely cited reasons for declining birth rates.

Studies show many younger adults are choosing to delay or limit having children due to economic uncertainty.

Ongoing debate among researchers

The authors stress that the findings are based on a working paper and should be interpreted with caution.

They say further research is needed to fully understand how smartphone use interacts with broader social and economic trends affecting fertility rates.