When JD Vance was on the campaign trail before the 2024 election, the future vice president had a signature issue: how to juice America’s birth rate with pronatalist policies. On Tuesday, Vance and his wife, Usha, announced that they are doing their part for the cause, sharing that they’re expecting their fourth child this July. “We’re very excited to share the news that Usha is pregnant with our fourth child, a boy,” read a post on the second lady’s official X account. “Usha and the baby are doing well, and we are all looking forward to welcoming him in late July.” The website is owned by Elon Musk, also a booster of the pronatalism cause, who has at least 14 children. Usha Vance is the first woman to announce a pregnancy while her husband served as vice president. The couple already have three children: eight-year-old Ewan, five-year-old Vivek, and four-year-old Mirabel. Their announcement includes a note of thanks to the staff who help them raise their family: “During this exciting and hectic time, we are …