"As you modify your baby's sleep behavior, you are going to have to give up middle-of-the-night crutches, known as negative associations, that may get her back to sleep in the short run but won't prevent her from popping up again in an hour. She may resist the change. The behavior may even get worse before it gets better as she adjusts to new routines, to new positive associations."
The benefits of sleep training baby can be substantial: Everyone in the household will be well rested, and sleep is essential to baby’s development. A landmark 2007 study from the National Institutes of Health suggested that critical brain-development periods are dependent on adequate sleep. “Sleep training baby may not be fun, but I always tell families that it’s not dangerous, and developing good sleep hygiene is, in my opinion, one of the best things you can do for your child,” Gold says.
Adapt the method to fit your family. If you want to try a method like this but find it too harsh, you can use a more gradual approach. For instance, you can stretch out Ferber's seven-day program over 14 days, increasing the wait every other night rather than every night. Remember your primary objective: To give yourself and your child a good night's rest.
Most sleep coaches say the ideal time to start sleep training (or promote independent sleep, not necessarily using the cry-it-out method) is based on your baby’s development, but is usually somewhere between four and six months, when your baby hasn’t had much time to get used to nursing or rocking to sleep. At this stage, most babies are also developmentally ready to learn the skill of falling asleep on their own, explains Jennifer Garden, an occupational therapist who runs Sleepdreams in Vancouver. Around four months of age, some babies go through a sleep regression because their sleep cycles change and there are longer periods of lighter sleep per cycle. “It’s a great time to work on independent sleep skills,” says McGinn. Other babies’ slumber derails around this time because they are working on new skills, like moving around and rolling. Some parents choose to wait until things settle down before embarking on a sleep-training method, but you don’t have to, says McGinn.