My father recently had lots of surgery, and when it was over, he'd lost most of his singing range. His (female) surgeon was puzzled, saying that she hadn't heard of that from surgery before, but it was common for women after childbirth. He mentioned this to a female singer friend of his, who'd just had her second, and she was gobstruck -- she lost almost all of her range after each birth, and the doctors told her they'd never heard of such a thing. So now they're both curious; has anybody else heard of this? And if so, does anybody know why it happens, or what to do about it besides keep singing and wait for it to slowly come back? (Which, by the way, has so far worked for both of them.)