Health and Human Services Secretary Robert F. Kennedy Jr. has baselessly tied alleged declines in sperm counts among teenagers to a “fertility crisis” or an “explosion in infertility.”
There is very little data on sperm counts in teenagers, and there’s mixed evidence on whether they have changed over time in adults. Regardless, experts told us there isn’t reason to believe declining sperm counts are causing the falling rate of childbirths in the U.S., which has more plausible social and behavioral explanations.
“Male sperm counts, I think, in this country are down 50% for teenage males,” he said on a May 28 episode of his recently launched podcast, after introducing concerns about a “stunning” drop in the rate of childbirths. “I read the other day that teenage males today have less sperm than the average 65-year-old American man.” At a May 11 event at the White House, he discussed statistics on childbirths, while also claiming a “fertility crisis” involving falling sperm counts in teens. “This is an existential crisis for our country,” he said.
Contrary to Kennedy’s statements, there is very little data about sperm counts in teenagers in the scientific literature at all. The studies establishing sperm counts in healthy adolescents have “never been done,” Dolores Lamb, who studies male reproductive biology and urology at Children’s Mercy Kansas City, told us.
