You know how children all make a little sound when picked up, just like adults? Well I've got a pop. of 25, have had lots of kids, and they ALL--repeat ALL--make the same sound. It's that sound that sounds kinda like, "Wah!" Think it might be a glitch...
On one of my previous games I had a breed-a-holic, back in the Dark Ages (i.e. level one fertility) when they couldn't breed unless you were there. I didn't want her to breed, so the moment I got on the loading screen I'd here "Smooch!" and when the village became visible, there she was holding a baby. She was one of my favorite villagers of All Time, but I was SO relieved when she died!