A study from Temple University last month, for instance, suggests letting babies cry themselves back to sleep is best to teach them to sleep through the night.
“By six months of age, most babies sleep through the night, awakening their mothers only about once per week. However, not all children follow this pattern of development,” said researcher Marsha Weinraub, professor of psychology at Temple. The study was published in Developmental Psychology.
That research looked at babies ages 6-36 months, measuring sleep/wake patterns, and found two groups — sleepers and transitional sleepers. By six months, two-thirds of babies sleep through or wake rarely in the night. But a third wake up most nights, a number that drops to two nights a week by 15 months and one night a week by 24 months.
That study’s “takeaway” is the importance of letting babies learn to get themselves back to sleep. “When mothers tune in to these night time awakenings and/or if a baby is in the habit of falling asleep during breast-feeding, then he or she may not be learning to self-soothe, something that is critical for regular sleep, Weinraub said.
“The best advice is to put infants to bed at a regular time each night, allow them to fall asleep on their own and resist the urge to respond right away to awakenings,” Weinraub said.
Or is it? When Wendy Middlemiss, an associate professor at the University of North Texas, looked at the question of helping a baby or letting him cry it out, she found that babies did, indeed, stop crying after a while. But measuring their cortisol levels, which indicates stress, showed they weren’t soothed; they’d just given up the notion that crying would bring help. Parents assumed the babies were no longer in distress; their own cortisol levels dropped.
Middlemiss said adults guide infants through regulating distressing emotions and that’s a pattern that prepares them when they’re older children to regulate their emotional responses, including calming themselves. Applying behavioral techniques too early in an infant’s development undermines the learning of emotional regulation, leading to more challenges with effective functioning of the stress response system.
She explained that a baby’s sleep pattern is just settling in the first six months and sleep training isn’t appropriate. After that, “beginning to help infants settle into a routine, not necessarily working on infants’ not crying, but just developing more of a pattern, is physiologically appropriate.”
Several methods settle a baby at night without upsetting him, she said. A parent can wake a baby and feed him or care for his needs, then let him fall back to sleep, increasing the time between the scheduled walks little by little. Some research suggests staying with babies when they fall to sleep, so they don’t cry themselves to sleep, doesn’t increase night wakings, so it can encourage sleep without tears, too.
Narvaez challenges some research assumptions. “The assumption by cry-it-out advocates is babies should sleep through the night. Where do they get that idea? That is not what babies do. The basic premise is flawed.”
A full-term baby has most of her neurons but needs to build the connections between them. Stress is not good for the process, research shows. It can even impact development of personality. One well-circulated study that included Narvaez found too much stress can damage a baby’s brain.
Interaction with babies matters, the researchers noted. When a baby is hauled around in a carrier but basically left alone — in a restaurant, at the mall, at home — optimal development is undermined. “They need touch” is how Narvaez put it.
Mice studies show that when baby and parent don’t interact, growth hormones and DNA synthesis stop. There are physical, intellectual and social impacts.
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