RE: The 5 Ss?
CIO means "cry it out". Baby sleep books tend to be either pro-CIO or are very anti-CIO. There are extremes in both camps and some books/philosophies are middle of the road (some CIO but not much, and done in as gentle a manner as possible). Personally, I have learned to be leary of "experts" who say the XYZ method always works for every baby. Every baby is different and has their own personality. You need to do what is comfortable for you and you need to discover your own baby's personality. Some babies are "easy" babies that sleep and eat like champs from the get go and some babies are more needy. Most babies are somewhere in between.
Also, it will be months before anything like CIO becomes an issue for you. In the first weeks, if baby is crying, it needs something (wet, cold, hungry, etc.) and needs to be tended to. If baby gets to be 5 - 7 months and is still not sleeping through the night, then you need to start making some choices about how you will begin to deal with night waking from that point on.
HTH,
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)