“There are many variations to any sleep training method. For example, you can do a cross between The Chair Method and PUPD with great success and fewer tears! There are also ways of breaking each method into smaller baby steps, which we recommend very often in our Personalized Sleep Plans®. Find what feels tolerable (because, frankly, no one ‘likes’ to sleep train), more comfortable for you, and what seems the gentlest, yet effective, on your baby, depending on his or her temperament and personality.”
Proponents of these sleep training methods say it's okay for your child to cry when you put him to bed and leave the room, although they don't advocate letting a baby cry indefinitely. Typically, these methods suggest putting your baby to bed when he's still awake and allowing short periods of crying punctuated by comforting (but not picking up) your child.
There are many different sleep training methods to choose from, but the most common methods are one of or a variation of one the five we've explained below. You might find that one of these methods sounds like it would be a perfect match for you, OR you might find aspects from each plan that you like. Just like Melissa said, don't feel like you need to stick to a certain method 100%. Make the plan work for you! 
Sleep training is a loaded phrase, and one that is often used synonymously with letting your baby self-soothe, or “cry it out,” but that’s not the whole picture, says Alanna McGinn, a certified sleep consultant and the founder of Good Night Sleep Site. “It’s more about being able to teach your baby that they are capable of falling asleep independently,” she says. You want your baby to be able to nod off on their own—ideally without nursing, rocking or using a pacifier—because whatever tools they use to fall asleep at bedtime are the same things they’re going to wake up looking for during the night. Yes, this can feel unloving and even downright cruel. You’ll find experts on both sides of the issue: Breastfeeding advocates say it’s normal for babies of all ages to wake up multiple times to nurse, and even the sleep coaches interviewed for this article disagree with how much crying and distress are acceptable.
×