Babies pick up their parents’ accents while still in the womb, according to a new study. After studying the crying patterns of 30 French and 30 German newborns, researchers concluded that the French newborns cried with a rising “accent” while the German babies’ cries had a falling inflection [BBC News]. The researchers believe that by mimicking their mothers’ inflections, the babies are attempting to form an early bond with their mothers.
Scientists already knew that a baby in the womb can memorize sounds from the outside world, and is particularly sensitive to the melodies of her mother’s language. But the new research showed an “extremely early” impact of native language and confirmed that babies’ cries are their first proper attempts to communicate specifically with their mothers [Reuters]. The data support the idea that crying seeds language development for infants, according to the scientists, who published their research in the journal Current Biology.
To hear the different between German and French crying babies for yourself, click here to listen.
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Image: flickr / chalky lives
The tender interactions between human mothers and their newborn babies may have deep evolutionary roots: a new study found that rhesus macaque monkey mothers engage in strikingly similar behavior with their infants.
The researchers found that the mothers would gaze intently at their newborns, sometimes even taking their baby’s face with their hands and gently pulling it towards them to get an even closer look. They would also engage in “lipsmacking” – an affectionate form of expression, where the macaques rapidly open and close their mouths [BBC News]. Several videos taken by the researchers show that just like human babies, the infant monkeys responded to their mothers by mimicking their facial expressions and returning their stares.
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The rate at which infants gain weight in the first six months of their lives is linked to those babies’ risk of becoming obese by age three, a new study has found. Researchers determined that sudden weight gain in early infancy was more important than how much a baby weighed at birth, the weight of the infant’s parents, or the number of pounds put on by the mother during pregnancy. “The perception has been that a chubby baby and a baby that grows fast early in life is healthier and all the baby fat will disappear,” said the paper’s lead author, Dr. Elsie Taveras…. “But [that] is not the case” [Chicago Tribune].
While the researchers note that early childhood obesity does not necessarily lead to obesity later in life, they say it does raise the risks. Obesity rates among U.S. children have doubled in the last 20 years, and almost a third of American children are either overweight or obese. The epidemic of obesity is linked to a host of health problems such as higher risks for heart disease, diabetes and cancer [Reuters].
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Babies just a few days old can already identify a rhythmic pattern, and their brains show surprise when the music skips a beat, according to a new study. Researchers played recordings that used high-hat cymbals, snare drums, and bass drums to make a funky little beat while monitoring the infants‘ brain activity with non-invasive electroencephalogram brain scanners, and found that newborns respond to a skipped beat in the same way that adults do.
The ability to follow a beat is called beat induction. Neither chimpanzees nor bonobos — our closest primate relatives — are capable of beat induction, which is considered both a uniquely human trait and a cognitive building block of music. Researchers have debated whether this is inborn or learned during the few first months of life, calibrated by the rocking arms and lullabies of parents [Wired News]. While the researchers who conducted the new study say their findings are evidence that beat induction in innate, others argue that the newborns could have already learned to identify rhythmic patterns by listening to their mothers’ heartbeats while in the womb.
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The fossilized pelvis of a Homo erectus woman who lived 1.2 million years ago on the banks of an Ethiopian river has been discovered, and while researchers say it casts new light on human evolution, some of their conclusions are challenging previous theories about these early human ancestors. The pelvis reveals a short, squat woman who wasn’t built for long-distance running, but also a woman with a wide birth canal to accommodate big-brained infants.
Study coauthor Scott Simpson says the pelvis’s wide birth canal indicates that hominds’ increasing brain size was a driving factor in human evolution. Getting through the birth canal is “the most gymnastic thing we ever do,” he says. To accommodate big-brained babies, humans must have developed larger and wider birth canals over time, but with few pelvic fossils, researchers had little idea when these changes began. The Busidima pelvis shows that a wide birth canal was already in place 1.2 million years ago [New Scientist].
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A new analysis of the skulls of three Neanderthal babies shows that the cranium of a newborn Neanderthal was about the same size as that of a newborn Homo sapiens, and that the Neanderthal children grew faster than modern humans in the first few years of life. The report on the young skeletons, which date from between 45,000 to 50,000 years ago, adds fuel to the debate over how similar Neanderthal culture was to that of our early Homo sapiens ancestors.
A big-headed infant skeleton found in Russia suggests that childbirth was no easy task for for Neanderthal women. Neanderthal mothers had slightly larger birth canals, but the prominent face of Neanderthal babies made it just as hard to push out as a modern human. This suggests that both groups had the social structures needed to help with childbirth [New Scientist].
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In a controversial new procedure, doctors removed the hearts from three severely brain damaged infants soon after the babies were removed from life support and transplanted the organs to three other infants, where the hearts were restarted. The news is raising complicated questions about when a patient can be declared dead, and whether doctors are pushing an already controversial organ-retrieval strategy beyond acceptable legal, moral and ethical bounds [The Washington Post].
The hearts of the three donor babies stopped beating soon after their ventilators were removed. In the first case, the Denver team waited three minutes after what appeared to be the last heartbeat. But because there has never been a case where the heart restarted itself after 60 seconds, they waited only 75 seconds for their next two cases [Reuters]. All three babies who received new hearts would have died without the transplants; six months after the operations, all three were doing fine. Doctors believe the swift organ removals from the donor babies increased the odds of survival for the recipient babies.
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Researchers have the best evidence yet that the brain chemical serotonin plays a role in sudden infant death sydrome (SIDS).
In a new study, researchers genetically engineered mice to have low levels of serotonin at birth, and found that more than half of the mice abruptly died before they were 3 months old. More intriguing, they had erratic episodes where their heart rate would drop and, five to 10 minutes later, so would their body temperature, [study author Cornelius] Gross reported. Sometimes they died in the midst of what Gross calls those crises, other times afterward [AP].
Serotonin is most commonly known as a mood regulator involved in depression, but it also helps control some of the body’s most basic functions, including breathing, heart rate, and body temperature. The mouse study supports earlier data gathered from the autopsied brain tissue of SIDS babies, which showed alterations in brainstem nerve cells that communicate using serotonin.
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After years of hectoring new parents about the need to keep babies protected from the sun’s fierce ultraviolet rays, doctors may be about to swing back the other way. A new study shows that many infants and toddlers aren’t getting enough Vitamin D, which is produced in human skin during exposure to sunshine.
Vitamin D is essential for bone growth and absorption of calcium in the digestive tract, and also plays a role in regulating the immune system. But doctors disagree on the severity of the problem posed by the low vitamin D levels found in the study, and are also divided on what course of action to recommend.
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