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Age-by-Age Sleep Training Guide

Find out the best time to try sleep training with your baby.
baby sleeping Sleep Training Must-Knows

"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."

What follows are her explanations of what's developmentally happening as your baby grows.