
Baby Sleep Training in 7 Days: The Fastest Fix for Sleepless Nights

And the research definitely shows that attempting to change the baby’s sleep biology with sleep training in the first 6 months of life does not improve the baby’s sleep habits or development down the track.
Pamela Douglas • The Discontented Little Baby Book

The Sleepeasy Solution: The Exhausted Parent's Guide to Getting Your Child to Sleep from Birth to Age 5
amazon.com