MONDAY, Jan. 27, 2014 (HealthDay News) -- Preschoolers with lots
of brothers and sisters seem to develop language skills a bit
slower than other kids -- possibly because they get less attention
from mom and dad.
But a new study suggests that a "sensitive" older sibling might
make up for it.
A number of studies have found that parents with a brood of kids
have less time to dedicate to any one child's learning. And some
have shown that the younger children in those families tend to have
less-developed vocabularies compared to their first-born
In the new study of 385 preschoolers, researchers found that
those from bigger families (at least three kids) did fare a bit
worse on a standard vocabulary test. But that gap was erased if a
child had an attentive older sibling.
Experts say the findings, reported online Jan. 27 and in the
February print issue of
Pediatrics, show that it's not only parents who help young
In studies on child development, "there's a big focus on
parents," noted lead researcher Heather Prime, a doctoral student
in clinical child psychology at the University of Toronto.
"But there is a place for sibling influences as well," Prime said.
Based on her team's findings, it's a "cognitively sensitive"
older sibling who makes a difference. That basically means the
older child is in tune with what a young sibling can understand,
and changes the way he or she talks to match that -- maybe slowing
down or using simpler sentences, but not "baby-talking" them,
"They pick up on cues the younger sibling is giving them," Prime said. "They might notice they're struggling with something, for example, and offer them extra help."
The findings are based on 385 Ontario families who were part of
a larger, long-term study on child development. Researchers
followed one child from each family starting at birth.
When those children were 3 years old, the researchers had them
play a picture game that measures "receptive" vocabulary -- the
words a child understands when other people say them. They also
observed the children as they played a structured game with their
older sibling, who was about 5 years old, on average.
Overall, the study found, preschoolers from big families tended
to score a bit lower on the vocabulary test. And the relationship
was still apparent when the researchers weighed other factors --
such as family income, and whether the parents were foreign-born or
spoke a language other than English at home.
However, in cases where those kids had a sensitive big brother
or sister, the vocabulary disadvantage disappeared.
And it wasn't just because parents were doing something right,
because the researchers also measured mothers' cognitive
sensitivity in interactions with their children.
"Even controlling for what moms were doing, we still saw the importance of the sibling," Prime said.
"This is a very interesting study," said Diane Paul, director of clinical issues in speech-language pathology for the American Speech-Language-Hearing Association in Rockville, Md. "And the findings make a lot of sense. We know that learning language is a social process."
What's "remarkable," Paul said, is that even kindergarten-age
children are able to perceive the needs of a younger sibling and
change how they communicate. "It seems like they're helping to
create a language-learning environment," she added.
Paul noted that, according to one theory, an older sibling might
get in the way of a preschoolers' language development -- by
speaking for the younger child, for example. And that might be true
in some cases.
But based on these findings, Paul said, a sensitive older
sibling may be an asset. She added, though, that this study only
looked at one aspect of language development -- receptive
"It would be nice to study other measures, too, like expressive vocabulary," Paul said. Expressive vocabulary refers to the words children not only understand, but use.
And how does a kindergartner become cognitively sensitive to
their younger sibling? It's not clear, Prime said. It may be a
combination of nature and what they learn from their parents and
other people in their lives.
But both Prime and Paul said parents can do things to encourage
more-sensitive interactions between their young kids.
An example Prime offered: Five-year-old Johnny and 3-year-old
Susie are fighting over a toy. Instead of just saying, "Susie had
it first," the parents could encourage Johnny to think about how
Susie would feel having that toy taken away from her.
Saying "your sister had it first" may teach a child a rule,
Prime noted. But the other approach helps them learn to consider
their younger sibling's thoughts and feelings.
The American Speech-Language-Hearing Association has more on
child language development.
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