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.
A consistent bedtime routine is the cornerstone of good sleep for children. It should also be a time for parents and babies to bond. Bedtime routines need not be complex. Bathe your child (if you like), change her into pajamas, read her a story, sing a song and feed or soothe her, then put her in her crib. The key is consistency — performing the same activities, in the same sequence, at the same time each evening.
Some families opt to hire a sleep consultant or sleep coach to help them with sleep training. Just like deciding what sleep training method is best for your family, the decision to hire a sleep coach is a completely personal one. We talked to Rachel Turner, a certified sleep consultant and owner of Hello Sleep, and asked her how why a family might consider hiring a sleep consultant. Here's what she had to say: 
It’s okay if you’re not ready. You aren’t missing out on sleep training if you skip it at 4 months: You truly can start sleep training at any age, even in the toddler years, although experts say it’s smart to be aware of developmental milestones and adjust baby’s sleep schedule accordingly. For example, the week baby learns to walk may be tough to implement a sleep-training schedule, and even a sleep-trained baby may see a regression simply because he’s going through such a developmental shift.

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I know a lot of my clients felt that way before they hired me! But I know it’s a concern that a lot of parents have when they’re thinking about getting some professional help with their little ones’ sleep habits. And it’s a valid question! After all, your mother managed to get you to sleep at some point. Your friend might have four kids who are all champion sleepers, so she should have some answers for you, right? Well, yes.. .and no!
There’s also no need to institute a regimented cry-it-out plan if what you’re currently doing is working for your family. But good sleep habits never hurt, and being able to fall asleep on one’s own is a necessary life skill. If you sleep-train at a time that’s developmentally appropriate for your baby and with the basic ingredients of healthy sleep in place, you can minimize the amount of crying your baby (and, let’s face it, you) will do.
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