This method is the medium option for sleep training. It involves laying your baby down when it's time to sleep, leaving the room to allow her the opportunity to figure out how to fall asleep on her own, and returning at timed intervals to briefly reassure her if she's crying.
The Controversy over CIO
There are a lot of opinions and research out there about the acceptability of sleep training and especially about letting your baby "cry it out." So I researched the research and my findings are in this blogpost. **Spoiler alert: the side effects of letting your child CIO are that your child will likely learn good sleep habits and they'll keep loving you during and after the sleep training process! Win-win!