The Smart Baby Sleep System is a step-by-step approach to optimize your baby’s sleep, based on brain science. It involves zero controlled crying (or Cry-it-out, CIO) and actually works with your baby’s and your instincts. In fact, instead of conditioning away your baby’s instinct to signal, it relies on them to gauge next steps in a transition (to crib sleeping, to reducing night feedings, etc.). With this approach you will listen more, not less, to your little one.