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When to Start Sleep Training

According to Dr. Karp, parents can start introducing sleep cues on baby's first night. "Everyone tells you you can sleep train at 3 or 4 months of age — they can't learn how to sleep before that," he says. "But how come they can learn bad sleep clues? Why can't they learn the good sleep clues? It's so transparently wrong, yet everyone keeps doing the same thing over and over again!"

Source: Flickr user alphaone

Read More Baby Sleep ScheduleDr. Harvey KarpBig Kid SleepBaby SleepInterviewsParentingBaby