In brief, what is the no-cry sleep solution in a nutshell? (I can't believe it's worth reading a whole book on it; in my exp. all these parenting books usually peddle one idea which is repeated over 200 pages - so am sure there will be a MNer who can provide a useful synopsis).
DS2 is 4mths. Have breastfed him to sleep since he was born, as it feels churlish not to - it's on tap after all. But am wondering if I am making a rod for my own back. At 4mths is he too young to be considered a candidate for sleep training of any sort? (At night, he wakes, gets fed, and then goes back in his cot no worries - daytime naps are variable).