I get those waves once every so often myself, although my tubes are tightly tied, as well. During those periods of time it seems that everywhere you go, people are either pregnant or toting around newborns.
A girl in my office is pregnant - due the beginning of March. She is so darn cute! I agree, Fran, that it probably is natures way. That longing is why our planet continues to be populated!
I get to watch my neighbor's 11 month old occasionally and that will have to do it for me!!