Sleep training is really about giving your baby space to learn to fall asleep independently. However you do it.
I’m pro sleep training, used the Ferber method at six months. Baby went from waking every hour or two his entire life needing to be rocked or fed back to sleep (which could take hours) to being put down, awake, in his cot, and falling asleep within a minute. From six or seven wakes per night to sleeping 12hr straight.
Best thing we’ve ever done. Broken sleep for months on end isn’t healthy for anyone, baby included, and it wasn’t tenable. To be able to keep going with that after half a year of sleep deprivation takes a heck of a lot of resources and privilege, that not everyone has. People often forget that not everyone is the same level of physical and mental health to begin with and that months of crushing sleep loss can absolutely destroy people.
You’ll often get misinformed people sharing stuff about it being damaging but thankfully the evidence doesn’t back that up. If you’re curious about the research there’s an excellent chapter in the book Cribsheet by Oster which is pretty up to date, it focuses especially on a study that’s often quoted as ‘proving’ that babies who are sleep trained are still just as distressed but don’t communicate it. It’s a real shame when people state stuff about how it causes attachment issues without evidence as it puts parents off considering it. Nobody has to sleep train but it’s a great option when you’re on your knees and can’t keep going, and most people I know did it when all else had failed! There are pros and cons to everything you do with your child, but I wasn’t willing or able to let us continue through more months of torture. People who claim it’s developmental and they’ll learn to sleep clearly haven’t met the primary aged kids who are up throughout the night or who are poor sleepers, still need settling, can’t sleep independently. Here’s some info with sources:
No peer-reviewed research has reported detrimental effects from sleep training.
pediatrics.aappublications.org/content/130/4/643
pediatrics.aappublications.org/content/early/2016/05/21/peds.2015-1486
pediatrics.aappublications.org/content/122/3/e621
pediatrics.aappublications.org/content/111/3/e203
Here's a look at the Middlemiss study, which is usually cited by people against sleep training or extinction (CIO): expectingscience.com/2016/04/21/the-middlemiss-study-tells-us-nothing-about-sleep-training-cry-it-out-or-infant-stress/
And here are the authors of some of the studies on child abuse and neglect say that anti-sleep-training people are mis-citing their work: ideas.time.com/2012/05/10/the-science-behind-dr-sears-does-it-stand-up/
A little information on the "cortisol" fear.
"In terms of their effects, the difference between short-term and chronic stress is one not of degree, but of kind. Short-term stress enhances memory; chronic stress impairs it. Short-term stress boosts the immune system; chronic stress weakens it.
So where does that leave us? A little stress, even in infancy, is fine, if not beneficial, but too much for too long is very, very bad.
Do we know exactly where sleep training fits in this spectrum? Just how much stress does a baby experience during cry-it-out?
The short answer is that we don’t know for certain. Everything we do know, however, suggests that this amount of stress, in the context of a warm, loving family, is just fine.
I believe that sleep training is not only not harmful, it is beneficial. Successful sleep training can decrease depression and chronic stress in the parents, and this benefits parents and their babies. Unlike sleep training, having a depressed mother during early childhood has been shown, repeatedly, to be linked with worse long-term outcomes for children."
expectingscience.com/2016/04/12/critics-of-cry-it-out-fundamentally-misunderstand-how-stress-affects-the-brain/
" To measure the effects on the babies, the researchers did something interesting: they measured the level of cortisol, a stress hormone, in the babies’ saliva. They also asked the mothers about their levels of stress. Twelve months later, they looked for any emotional or behavioral problems in the babies, and they also did testing to see how attached the babies were to their mothers.
Here’s what they found. The babies in the graduated extinction group and the bedtime fading group both fell asleep faster and had less stress than the control group — and not only that, their mothers were less stressed than the control group mothers. Of the three groups, the extinction group babies were less likely to wake up again during the night. And when it came to emotional or behavioral problems, or attachment, all three groups were the same.
This means that it’s okay to let your baby cry a little. It’s not only okay, it may lead to more sleep all around. Which makes everyone happier."
www.health.harvard.edu/blog/new-study-says-okay-let-babies-cry-night-201605319774