Researchers discover the best way to get a crying baby back to sleep
[Sept 15, 2022: Adam Phillips, RIKEN]
The study details how crying babies are physiologically affected by being held, carried, and laid down. (CREDIT: Creative Commons)
New research published in Current Biology demonstrates the importance of carrying crying infants rather than simply holding them. Led by Kumi Kuroda at the RIKEN Center for Brain Science (CBS) in Japan, the study details how crying babies are physiologically affected by being held, carried, and laid down.
The data yield a simple but cost-free and effective technique that increases the chance of getting a crying infant to calm down and sleep in bed.
Most parents know the occasional frustration and discomfort of dealing with a crying baby. For some, it’s a regular occurrence that affects the baby’s ability to sleep and stresses out the parents. What can you do in this situation? Kuroda and her team found a “Transport Response” in distressed mouse pups and human babies in which infants calm down when carried by their mothers. The response is a complex series of parallel biological processes that result in reduced crying and lower heart rates, which helps parents to transport the infants.
The new study used a baby ECG machine and video cameras to systematically compare changes in heartrate and behavior as mothers acted out activities that are commonly used to calm infants, including carrying, being pushed in a stroller, and holding while sitting.
Data during these activities were recorded from babies that were crying, awake and calm, or sleeping. At each heartbeat, behavior was assessed as asleep, alert, or crying, and scored accordingly. This way the researchers could track changes in both behavior and physiology with sub-second precision.
The experiment led to a few important findings. First, as Kuroda explains, “walking for five minutes promoted sleep, but only for crying infants. Surprisingly, this effect was absent when babies were already calm beforehand.” Among the babies studied, all had stopped crying by the end of the five-minute walk and had reduced heart rates, and about half were asleep. Second, sitting and holding crying babies was not calming; heart rates tended to go up and crying persisted.
The heartbeat measure allowed the researchers to dissect the effect of each micro-activity as infants were handled. The researchers found that the babies were extremely sensitive to all movements by their mothers. For example, heartrates went up when mothers turned or when they stopped walking.
Based on the 'Transport response' in which distressed animals calm down when carried, the behavioral and physiological data in this study showed that when babies are crying a lot, walking for about 5 minutes, following by sitting for about 8 minutes should help calm them down and put them to sleep. (CREDIT: RIKEN)
The most significant event that disturbed the sleeping infants happened just when they became separated from their mothers.
Every mother has experienced the disappointment of having a finally sleeping baby wake up again after being put down. The researchers pinpointed the problem using the heartbeat data.
Walk then sit: A scientific recipe that helps babies stop crying. (CREDIT: RIKEN)
“Although we did not predict it,” says Kuroda, “the key parameter for successful laydown of sleeping infants was the latency from sleep onset.” Babies often woke up if they were put down before they got about 8 minutes of sleep. Thus, based on the data, Kuroda recommends that when babies are crying too much and can’t sleep, mothers should carry them steadily for about 5 minutes with few abrupt movements, followed by about 8 minutes of sitting before laying them down for sleep.
Although this procedure does not address why some babies cry excessively and cannot sleep, it offers an immediate solution that can help parents of newborns. Additionally, the researchers recognize the usefulness of heartrate data in this age of wearable fitness devices.
Video demonstration of the WalkHold method at work. (CREDIT: RIKEN)
“We are developing a “baby-tech” wearable device with which parents can see the physiological states of their babies on their smartphoness in real-time,” says Kuroda. “Like science-based fitness training, we can do science-based parenting with these advances, and hopefully help babies to sleep and reduce parental stress caused by excessive infant crying.”
About about 20%–30% of infants cry "excessively and exhibit sleep difficulties" for no known reason, the researchers said, and their goal was to provided an immediate solution for parents. More research is needed to determine if this method could improve sleep long-term, the team determined.
"Like science-based fitness training, we can do science-based parenting with these advances, and hopefully help babies to sleep and reduce parental stress caused by excessive infant crying," Kuroda said. "We need science to understand a baby’s behaviors, because they’re much more complex and diverse than we thought."
For more science stories check out our New Discoveries section at The Brighter Side of News.
Note: Materials provided above by RIKEN. Content may be edited for style and length.
Like these kind of feel good stories? Get the Brighter Side of News' newsletter.