Mingaile Kieraite remembers what it felt like observing those close to her become parents. As family members shared updates on their pregnancies and friends dragged her to kid-friendly events, she began to feel isolated, as if she wasn’t being let into an exclusive club. But Kieraite, 33, had already decided she didn’t want to join the club. From a young age, Kieraite never had an intense, or even middling, desire to have kids. She’d helped raise her cousin, a responsibility that was foisted upon her, and found the experience challenging. Now with more control over her circumstances,...