There's a new edition of "Good Night, Sleep Tight" by Kim West out today. This book represents a gradual, tolerable approach to sleep that's not "crying it out" and can be tailored to each individual family's situation. HIGHLY recommend. amazon.com/gp/product/073828…
Some pediatricians and parenting authors suggest starting CIO as early as 1-2 months (yes, I've heard this from parents) or at least by 4-months. There is virtually no research on the use of CIO with infants under 6-months. #sleeptraining#infants#research