A.P.
The author of Babywise has recanted his former 'method' of sleep training; he was also excommunicated from his church because his ideas have led to the starvation of some babies. New babies need to be held. They don't get hungry because the clock says they aren't yet. If you were little, confused, hungry, and lonely, would you want to be left alone in some vibrating or swinging chair? I certainly wouldn't. I'd want someone I loved and trusted to take care of me. Please don't buy into the idea that you're actually helping your child by 'training' her to sleep.
A great alternative to look through is the No Cry Sleep Solution by Elizabeth Pantley. The goal is the same: helping a baby learn to sleep well; the method is very different, and that makes all the difference in the world. By the way, I have two beautiful NO cry-it-out girls who were not left to cry alone to sleep. They sleep 12 hours straight; no nightmares, no issues. They're great sleepers, and they've developed just fine. Good luck :)