Which side wins? At this point in sleep research, neither. NAP styles are not well studied (tough to do because parents implement them in such variable ways), and they are undergirded by attachment theory, a concept that’s in flux. CIO styles have been shown to get kids to sleep through the night more quickly, but science hasn’t weighed in on whether that’s best for baby or just more convenient for our modern culture. In the end, it’s up to you to decide what feels right, based on your baby.
