I don't know. I tend to agree with RCW on this one. I have 2 kids of my own and I baby sit my nephews who are turning 1. Routines and sleepy clues work. Finding what is right for each baby works. With DD it was a little rocking, DS needed to work it out on his own, N1 needs quiet time, N2 does it alone like DS did. I needed and still need time to do other house stuff. I'm not about to spend all day rocking babies and refusing to vacuum because they don't sleep well.