RFK Jr. – Secretary of Health and Human Services Robert F. Kennedy Jr. said a “fertility crisis” for men began in 1970 and is now a national emergency, tying it to the White House’s push to boost birth rates. Scientists he cited dispute some details, while other researc
When Robert F. Kennedy Jr. took the stage at a White House maternal health event Monday, he framed the country’s declining birth rate as an urgent, biological problem—starting with men.
“The fertility crisis for women began in 2007; for men in 1970,” Kennedy said.. “Men had twice the sperm count as our teenagers do today.. This is an existential crisis for our country.” He added that while earlier presidents allegedly discouraged “childbirth and motherhood. ” “We now have a president who is trying to encourage it.”
The remarks came as the Trump administration continues to market policies and messaging aimed at boosting births. including efforts tied to fertility care.. But Kennedy’s specific claim—linking falling birth rates to shifting sperm counts—has drawn immediate pushback from researchers who say the science is mixed and the policy narrative may be pointed in the wrong direction.
Kennedy’s comments also sit atop a familiar pattern: he has repeatedly raised concerns about issues he believes affect reproduction. including his public record on vaccines. and his long-running feud with fluoride.. And while he has backed animal protein and raw milk in other remarks. the new controversy is his focus on men’s fertility—an angle he has returned to before.
At the same Monday event, administration messaging echoed pronatalism.. Dr.. Mehmet Oz. head of the Centers for Medicare and Medicaid Services. said “1 in 3 Americans are under-babied. ” defining it as “you either don’t have any children or you have less children than you would normally want to have.” Kennedy. presenting himself as “the father of fertility. ” made the case that improving men’s sexual function is part of increasing women’s ability to give birth.
The science Kennedy referenced offers both support and dispute.
In Kennedy’s remarks, he cited Dr.. Hagai Levine, lead author of a 2022 systematic review and chairman of Israel’s association of public health physicians.. Levine agreed with Kennedy’s characterization that there is a “crisis. ” telling reporters: “I truly believe based on the data that there is a male fertility crisis globally and in the U.S.” He said the problem is reflected in a “biological measurement” that can be “count[ed] very accurately.”
Levine’s 2022 study was a systematic review of 223 studies that found a 50 percent decline in both sperm concentration and total sperm count between 1973 and 2018 across North America, Europe and Australia.
Yet Levine’s position is not the last word.
A different study published in January. “Sperm concentration remains stable among fertile American men. ” found no clinically significant decline in sperm concentration among American men between 1970 and 2018.. Dr.. Scott Lundy. the lead author and Urology Program Director at Cleveland Clinic. said in a blog post that researchers had “expected to find a subtle decrease over time. not a drastic decrease. ” and that “finding nothing at all was a little bit surprising.” He added: “it certainly does not mean that we can ignore this issue or not study this further. ” but said “in this case. I think there’s at least some evidence to suggest that we can be somewhat reassured.”
Levine acknowledged why the literature can clash. He said different methodologies can yield contradictory results and emphasized the need to compare studies with similar laboratory methods.
“It’s good that in science there are others who make other claims and try to look at other things. ” Levine said.. “But when I looked at the literature, I was not convinced that there is no decline.. I plan to update our study; maybe there is new data.. And I hope that I will find that the decline stopped or even reversed.”
Levine also argued that lower sperm counts can signal broader health problems. saying recent studies link reduced sperm count to higher morbidity.. He said more work is needed to identify the causes of declining sperm counts. pointing to animal research where certain chemicals can disrupt the endocrine system.. He also cited potential contributors including obesity. lack of physical activity. smoking. binge drinking. “certain drugs. ” occupational exposures. and climate change—specifically rising temperatures.
Still, even Levine said it is unclear how much sperm count changes alone have driven the U.S. birth-rate decline.
“We know that. for example. women’s education is very related to the number of children in a family. ” Levine said.. “So I would assume that social demographic changes are the main reason for the shifting trends in fertility. meaning the number of children per woman of childbearing age in the United States and in many other countries.”
Stanford’s Dr. Michael Eisenberg, a professor of urology, said concerns about declining sperm counts have circulated in urologist circles for decades and became more controversial in the 1990s and 2000s. But he said evidence has strengthened in later years.
“There is still some controversy in the field, but I think generally the consensus is — and I certainly believe — that sperm counts are declining,” Eisenberg said.
He also said the field lacks what many wish it had: systematic national monitoring.
“Most of the studies on sperm count are meta-analyses, which are studies of studies. There is no systematic tracking of sperm count or national effort to monitor semen health in the United States,” Eisenberg said.
Eisenberg argued that the male role in fertility is overlooked.
“When people think about fertility, I think that unfortunately the male role in that is somewhat undervalued and underappreciated,” he said. “Women have regular cycles, so they have some sense of their fertility potential, whereas men don’t have that feedback.”
But outside urology research, demographers and fertility-behavior experts say the policy emphasis on sperm count misses what most Americans cite when they delay having children.
Karen Guzzo, PhD, professor of sociology and director of the Carolina Population Center at the University of North Carolina, said Kennedy’s remarks reflect an insistence on finding a physiological explanation for population decline.
“The reality is that most Americans who want to have children want to have two or three children,” Guzzo said.. She argued that people are not choosing to stay childless because they are physically unable. but because they do not feel they can safely and financially support a family at the stage of life they are in.
“The reason that people aren’t having kids or are delaying having kids isn’t because they’re physically unable. It’s because they don’t feel like they’re able to have kids at that point in their life, given their social and economic circumstances,” Guzzo said.
She said what counts as increased infertility is often tied to timing, not biology.
“Any increase in infertility is largely due to more people delaying having children,” Guzzo said.
In her view, the decision is typically shaped by the search for stability.
“People aren’t just deciding at 18. ‘Oh I don’t even want to have kids until I’m 38.’ It’s usually because they want to get to a point in their life where they’re like. ‘All right — now I have enough money.. Now I have a stable partnership.. Now I feel that I can provide a good life for children,’” she said.
Guzzo pointed to specific supports she said make it easier for people to commit to parenthood: “affordable childcare, strong unions and union jobs, affordable higher education, and accessible healthcare — including maternal and reproductive healthcare.”
On the question of sperm count, Guzzo called the focus a “clear misdirection.”
“Young women are like, ‘Yeah I’m not asking for the most sensitive guy in the world. I just want a guy that thinks that I should not die in childbirth and that I can also have a job,’” she said.
She added that gender roles and expectations are what actually shape many men’s participation in family life.
“Real men are secure enough in their masculinity that they can, in fact, change diapers and stay home with their children and be active parents.”
Kennedy’s Monday framing is not his first time revisiting fertility biology in public.
In December, he mentioned sperm count during an HHS announcement about coverage for in vitro fertilization (IVF). And in April 2025, he made similar remarks to Fox News’ Jesse Watters, asserting that “an American teenager today has less testosterone than a 68-year old American man.”
The language he used Monday also tracks broader messaging from President Donald Trump. who has called himself the “fertilization president” and the “father of IVF.” At the White House event. Kennedy referred to himself as “the father of fertility.” Other officials have also pressed fertility concerns.
The administration’s pronatalist approach has courted the belief that a declining birth rate is the central problem—and that policy should encourage Americans to have more children.. Elon Musk. a pronatalist and former head of the so-called Department of Government Efficiency. is believed to have fathered at least 13 children by at least four different women.
But at the core of Kennedy’s remarks is the idea that men’s reproductive health is both measurable and politically consequential—an approach that is landing in the middle of a scientific debate and a louder argument over whether social policy should be the centerpiece.
Levine said the biology may matter, but stressed that the magnitude and population-level impact remain uncertain.. Guzzo’s critique goes further: she said the physiological explanation is being used as a detour from economic and social constraints—constraints that. in her view. do more to determine whether people feel ready to start families.
For the administration, sperm count has become part of a wider pronatalist campaign.. For researchers in fertility behavior. the question now is whether the White House will match its attention to men’s biology with the kind of childcare. union. healthcare and education commitments that many families say determine whether they can afford to have children.
Robert F. Kennedy Jr. HHS maternal health sperm count male fertility crisis birth rate IVF pronatalism Centers for Medicare and Medicaid Services Mehmet Oz Hagai Levine Scott Lundy Michael Eisenberg Karen Guzzo
so sperm count is why people aren’t having kids now?? i mean ok
He’s not wrong that birth rates are down, but blaming it on 1970 sperm count sounds like one of those headline things. Also didn’t they say this was like from chemicals or something? who knows.
I read that fertility crisis started for women in 2007 and men in 1970… so are we just supposed to pick the timeline that makes the president look guilty? My cousin had kids fine, and he’s like 2 years old in my head so idk.
If scientists are disputing it, then why is he saying it like a national emergency? Sounds like politics dressed up as biology. Like, are we blaming the White House for sperm count now too? because that’s a wild leap, but also I kinda believe the fertility care marketing part has something to do with it. Anyway, this is just gonna turn into another culture war thing.