These diseases had once been extraordinary rarities. When HIV hit, they were everywhere. I remember how I blew up gloves into balloons to distract the kids, so small and polite, their hair neatly braided. I remember how they died.

Almost 136,000 babies are expected to be born with HIV in the next three months, mostly in Africa, because of the Trump administration’s “stop work order” on foreign assistance, according to a top research foundation.