This sleep training technique usually involves quite a bit of crying on your baby’s part for the first couple of nights but some say it tends to be less crying, overall, since sleep training is ‘done’ faster (for many, but not all, people). The way it works is simple – you do your bedtime routine, put your baby to bed awake, and then leave the room without returning for checks. If your baby cries, you are not supposed to go in to check on her; instead, you let her ‘cry it out’ on her own. The thinking here is that if you allow your baby to cry for a period of time, but then go in and ‘rescue’ her, you have all but guaranteed that she will cry for that amount of time the next night because she will expect you to come and “rescue” her again.
"I have a 6-month-old who has refused to sleep longer than 30 to 90 minutes day or night since he was born! I've tried everything out there except CIO. He's strictly breastfed and relies on that or rocking to get to sleep. He doesn't know how to soothe himself to sleep, and he naps for only 15 minutes. I'm severely sleep deprived. I don't have the heart for CIO, but I think I'll try the revised method where you pat him down and reassure him lovingly while allowing him the opportunity to comfort himself. He's been co-sleeping since day one, and it's going to be tough, but I'm at my wits' end and cannot function."
While you may have read up on various sleep training methods while pregnant or in the early weeks of baby’s life, it’s a good idea to speak with your pediatrician before you start. For example, if your child is gaining weight slowly or was a preemie, he may not be ready to drop a nighttime feeding and may need a sleep-training schedule that’s adapted to a few middle-of-the-night wake-ups.
If your baby is older than six months, don’t worry, McGinn says: “It’s never too late to develop good sleep habits.” Dickinson says he finds nine months to be a bit of a sweet spot for parents in terms of getting babies to sleep through the night. “They are at a good age for understanding routines and don’t need to eat during the night,” he explains.