The very best sleep advice I’ve gotten or read has come from the book Baby 411. The best part of the book is it gives a summary of all the sleep books out there. Their “Ten Commandments” for establishing a sleep routine are really great. We followed these starting at 2-3 months and now most of the time with our 6 month year old we simply put her in her crib while she’s awake or partially awake and she goes to sleep on her own–for both naps and bedtime. I wouldn’t have known to do this or how to do this without the advice in this book. It was great to get this data while she was 1-2 months old, so I knew what to do–and we didn’t establish bad habits in the first place.