Yes. Multiple studies have shown that sleep training is both safe and effective, without any studies showing evidence of harm. The best long-term study followed 326 children for the first six years of life. The authors reported that children who had sleep trained via any method in infancy slept better at 2 years of age than children who were not sleep trained, and their mothers were less likely to be depressed. Several years later, the researchers looked at these children again and noted that there was no evidence of emotional or behavioral problems in children who had been sleep trained versus those who had not. As part of this follow-up, the researchers measured the children’s levels of the stress hormone cortisol, which is frequently cited by opponents of sleep training as the mechanism by which crying affects developing brains. The researchers did not find any evidence of differing levels of cortisol secretion between children who had been sleep trained and those who had not.
Create a comfortable sleep environment that's tailored to your child. Some babies need more quiet and darkness than others. Recordings of soft music or nature sounds or the sound of a gurgling aquarium can be soothing. Make sure the sheets are cozy (warm them with a hot water bottle or a microwavable heating pad, for example, before laying your baby down) and that sleepwear doesn't chafe or bind. Younger babies may sleep better when swaddled. Don't overdress your child or overheat the room.
Create a comfortable sleep environment that's tailored to your child. Some babies need more quiet and darkness than others. Recordings of soft music or nature sounds or the sound of a gurgling aquarium can be soothing. Make sure the sheets are cozy (warm them with a hot water bottle or a microwavable heating pad, for example, before laying your baby down) and that sleepwear doesn't chafe or bind. Younger babies may sleep better when swaddled. Don't overdress your child or overheat the room.
Crying isn't the goal of this sleep training method, but advocates say it's often an inevitable side effect as your baby adjusts to sleeping on his own. They say the short-term pain of a few tears is far outweighed by the long-term advantages: A child who goes to sleep easily and happily on his own, and parents who can count on a good night's rest.
Do your research! There is a lot of information about there about sleep training, and much of it is controversial or contradicting. However, just like making any important decision, your choice to sleep train (or not sleep train) should be informed by your own reading, research, and inferences. Furthermore, there are many different methods of sleep training (which we’ll cover in this article as well) and you’ll need to decide which method is right for you.
"By the time your baby is 3 months old and has developed a fairly predictable 24-hour pattern, it becomes more important for you to provide increasingly consistent structure. If you do your best to establish a reasonable and consistent daily routine and keep to it as much as possible, then it is likely that your child will continue to develop good patterns. If instead you allow the times of your child's feedings, playtimes, baths, and other activities to change constantly, chances are his sleep will become irregular as well."

Pantley offers a gentle and gradual approach to all aspects of sleep, customized to your baby's needs. She recommends rocking and feeding your baby to the point of drowsiness before putting him down – and responding immediately if he cries. Parents are urged to keep sleep logs, nap logs, and night-waking logs. Pantley also describes a six-phase process for teaching a child to sleep in a crib.
Finding the ideal bedtime can be tricky in the first few months of life. Infants who take a late afternoon nap (say, 4 to 6 p.m.) may go to bed as late as 9 or 10 p.m. A good rule of thumb is that your baby will probably sleep three to four hours after his last nap ends, but you may need to experiment, adjusting your baby’s nap and bedtime schedule to figure out what works best.
If your baby is growing poorly or is difficult to console, you should talk to your child’s pediatrician to ensure that your child’s sleeping difficulties have no medical cause. Likewise, if you are struggling with depression, it is critical to discuss this with your child’s pediatrician as well as your own physician. Poor sleep can prolong postpartum depression in mothers.

C.I.O. is the most famous sleep training technique, and the most controversial — although, despite its daunting name, it is safe and effective. In its simplest form, unmodified extinction, you place your infant down at bedtime, drowsy but awake, and then leave the room, without returning to check on or soothe your baby. This method will work quickly, but often produces prolonged periods of crying for a few nights, which can be difficult for parents to tolerate.
"My 5-month-old was waking every two hours at night. I was so tired I wanted to die. I finally caved in, put in earplugs, and let him cry it out – which he did, all night! But then, something amazing happened the next night: He slept a full 12 hours and awoke rosy and cheerful. It's been that way ever since, and he's even a better napper now. I know that it is hard to listen to your precious little one cry, but a sleep-deprived, miserable mom and baby is a terrible thing too."
This method involves more tears than the previous two; however, you don’t leave your baby unattended in the room at all. Here’s how the chair method works: start by doing your normal bedtime routine. Then, put a chair very near the crib, bassinet, or bed and sit on the chair as your baby falls asleep. The goal is not to help your child fall asleep, nor to help her calm down necessarily, depending on how you implement it. You are generally not supposed to give your child any attention. The reason you are in the chair is only to reassure them that you are there with them and have not left them alone. Each night you move the chair farther and farther away from the crib until you are right outside the door until eventually, you no longer need the chair at all.
My lo completed 3 months this month 1st. She hardly crosses 1 sleep cycle (40-50 mins). I try extending her nap by patting,holding her, rocking . Sometimes, she sleeps but most of the time she fights and refuses to nap again. She cries and fusses till next nap cycle off and on. Is it sleep regression? Am at my wits end. Her nighttime is getting worst day by day. She Is up every hour or two. Things are getting worse . She used to give 6 hr stretch then 3 hrs. Should I start sleep training? She is almost 16 weeks.

"My son is 6 months old and finally goes to sleep without a struggle! We thought the Ferber method was mean and that alternatives would be better. So we tried it all – Baby Whisperer, No-Cry Sleep Solution, Babywise, etc. None of it worked. Our son is an otherwise happy little guy, but every night and every nap was a battle. We'd spend hours trying to get him to sleep. We delayed trying Ferber until we'd tried everything else unsuccessfully. It worked after the first night! He wakes up better rested and happier (as do we)."

This is considered a ‘cry’ method of sleep training. This technique entails allowing your baby to cry while checking on him at intervals. The goal here is to reassure him every so often that you are nearby and to reassure yourself that he is okay. When you go to check on your baby, you are not “supposed” to pick him up nor engage him much, but simply reassure him using your voice and a loving pat for 2-3 minutes, tops (watch the clock!). With this sleep training method, the goal is NOT to help baby fall asleep – that is what he is learning to do on his own! Instead, the idea is that he falls asleep on his own, in the same “environment” in which he will awaken periodically throughout the night. The knowledge of how to fall asleep unassisted at bedtime will pave the way for him/her to go BACK to sleep throughout the night. Over time, you gradually increase the amount of time between your ‘checks’. See a more detailed step-by-step explanation of this method here: The Ferber Method
Raising a healthy sleeper starts with a consistent bedtime routine. You can start enforcing this when your baby is roughly six weeks old. At the same time every night, read a book together, sing songs, and feed your baby before putting him or her into the crib. It may also help to get your child up at the same time every morning and put him down for naps at regular times.

"My well-meaning friends are all Ferber addicts. I went against my own instincts with our son and tried with no success. They promised it would get better each night, but on the third night he cried for three hours, much longer than the first two. I felt like a failure and, of course, stressed from all of his crying. Babies have their own personalities, and you shouldn't feel pressured into doing something that 'works for everyone else.'"
"My 3-month-old doesn't sleep through the night, and it's fine with me. I keep her in her crib or a bassinet until her 3 a.m. feeding, and then she joins my husband and me until we get up for work. She won't go in her crib unless she's already asleep, usually from nursing and rocking, but she'll fall asleep in her bassinet beside our bed. She's happy and we're happy, and even if it goes against the wisdom of the experts, it's working for us."
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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.
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