"There are good times to sleep-train and periods when it may be less likely to work," says developmental psychologist Isabela Granic, Ph.D., coauthor of Bed Timing: The 'When-To' Guide to Helping Your Child to Sleep. "This is because infants and toddlers go through mental growth spurts that make them especially clingy, fussy, and prone to night wakings. They're learning new cognitive skills and often don't sleep as well."
No one likes to talk about sudden infant death syndrome (SIDS); it is a terrifying topic. SIDS is defined as the sudden death of an infant, which remains unexplained after a thorough investigation. These deaths occur in the first year of life, with the highest risk occurring between 2 and 6 months of age. Fortunately, these deaths are becoming less common, thanks in large part to the early ’90s Back to Sleep campaign, which urged parents to place infants to sleep on their backs. Suffocation is also a major risk for infants if they do not sleep in a safe sleeping environment.
A version of this technique called graduated extinction was popularized by Dr. Richard Ferber in his book “Solve Your Child’s Sleep Problems.” Here, parents check on their child at set intervals. Checks should be brief and to the point: Picking up your child, spending too much time hovering over the crib or otherwise offering more contact than a quick soothing word can be counterproductive. Some babies find these brief checks soothing and will go to sleep more quickly. Others will redouble their crying as soon as their parents leave the room. Parents need to make a judgement about whether or not checking in is helping their baby through this process. If you decide to use checks, I would recommend checking no more than every five minutes and resisting the temptation to check if your child seems to be calming down.
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.