Parents are often hesitant to go this route, worried about how much crying will be involved. While McGinn doesn’t deny it can be difficult at first, she finds parents are often surprised by how quickly it works. “Yes, there is a lot of crying, but it’s short term,” she says. “You might get a lot of crying for two to three nights, but then every night is less and less.” She says you should see significant improvement with this method by night three or four but adds that it’s important to try it for a week before determining that it’s not working.
"The more practice your baby gets putting himself to sleep, the quicker the process works. He will fall asleep on his own, and you will get the sleep you need...Don't wait too long, though. The earlier, the better. Remember, once your baby gets older – that is, at least 5 or 6 months – the process of getting your child on a sleep schedule and to sleep through the night gets more difficult."
The idea behind extinction (or full extinction to differentiate it from graduated extinction) is that you want to extinguish the behaviour (crying) by not responding to it. As with the check-and-console method, go through your bedtime routine, put them in their crib awake, say good night and walk out. This is certainly the most controversial sleep-training method, and even experts disagree on what you should do next—it all depends on what stage your baby is at developmentally, as well as what works for the parents.

While researching the different sleep training methods to decide which one is right for you, also remember that every baby and every family is different. What one mom swears by, another mom swears off. You will see the most success from sleep training if you use your intuition to pick a method that you know you and your baby will be comfortable with.

Sleep experts who support the cry it out approach (as well as most pediatricians) disagree. They say it isn't traumatic for babies to cry alone for short periods of time with frequent check-ins by Mom or Dad – and the end result is a well-rested, happier child. They say no tears sleep strategies may cause babies to be overly dependent on comfort from a parent at bedtime, making it harder for them to learn to soothe themselves to sleep.
Prepare yourself for a few difficult nights. Hearing your baby cry can be excruciating, as every parent knows. During the waiting periods, set a timer and go to a different part of the house, or turn on some music, so you don't have to hear every whimper. As one BabyCenter parent says, "The first week could be rough. Try to relax and know that when it's all over, everyone in your household is going to sleep more easily and happily."
Sleep training means using behavioral techniques to teach your baby to sleep independently by altering her “sleep onset associations” — or the circumstances your baby needs to fall asleep at bedtime. By removing your presence at bedtime, you are providing new associations with the result that she will learn to fall asleep independently, both at bedtime and when she awakens during the night.

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.
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