Moderate and severe learning disabilities are also significantly more common in twins than in singletons, even when corrected for lower birth weight and when those with CP are excluded (9).
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Do twins have learning disabilities?
The relationships between genetic, perinatal and social factors and learning disability were also determined. It was found that 12.5% of twins had learning disabilities. The most common neurodevelopmental dysfunction were language disorders, poor graphomotor fluency and poor fine motor dexterity.
Are twins more likely to have special needs?
That’s because twins are born prematurely 60 percent of the time and land in the costly neonatal intensive care unit more often than singletons. The article also mentions that these babies are more susceptible to mental retardation and learning disabilities.
Are twins more likely to have defects?
Multiples are about twice as likely as singleton babies to have birth defects, including neural tube defects (such as spina bifida), cerebral palsy, congenital heart defects and birth defects that affect the digestive system. Growth problems.
Do twins tend to be less intelligent?
Twins on the average seem to have lower IQs than singletons. The best estimate for this group difference is 4.2 IQ points (less than one-third of a standard deviation), with a great divide between study outcomes of less vs more recent birth cohorts (5.1 vs 0.5 IQ points, respectively).
Do twins have a higher rate of autism?
Using a mathematical analysis of data, his team found that identical twins were much more likely to have similar levels of autistic symptoms than fraternal twins. Those researchers also concluded that: High levels of autism symptoms are genetic in origin. Less severe symptoms are not as likely to be inherited.
How does being a twin affect child development?
Most previous studies reported that twins have lower cognitive ability than singletons. In a very large study of children born in Birmingham, United Kingdom, between 1950 and 1954, twins had a deficit in verbal reasoning scores at age 11 of 4.4 points on average.
Why do so many twins have autism?
Studies in twins have shown that autism has genetic origins: A child is more likely to have autism if his or her sibling or twin also has the disorder. But there is also evidence that factors other than genetics, collectively referred to as ‘the environment,’ play a role.
Why do twins have autism?
According to the authors, these findings suggest that non-shared environmental factors – which would almost exclusively occur during or after birth – contribute to the differences in development and severity of the social traits of autism in these twins.
Do twins have more developmental delays?
Conclusions: Healthy twins should be considered at a higher risk for developmental delay. Whether these results are comparable to preterm singletons, or whether there are twin-specific issues involved, should be further investigated in a study that uses a matched singleton control group.
Is one twin healthier than the other?
By studying identical twins, the researchers were uniquely able to control for both genetic factors and maternal risk factors. Although identical twins also share a placenta it is divided into two separate compartments, and one may be healthier than the other.
Why are twins considered high risk?
Why is multiple pregnancy a concern? Over 60 percent of twins and nearly all higher-order multiples are premature (born before 37 weeks). The higher the number of fetuses in the pregnancy, the greater the risk for early birth. Premature babies are born before their bodies and organ systems have completely matured.
Are twins as healthy as singletons?
Background: Twin pregnancy is associated with more pregnancy complications and poorer pregnancy outcome than singleton pregnancy.
Why do twins have lower IQ?
At age 7, the mean IQ score of twins was 5.3 points lower than that of singletons in the same family, and at age 9, the score was 6.0 points lower. The lower intelligence of twins in childhood may partly be a consequence of the reduced fetal growth and shorter gestations of twins, say the authors.
Is IQ learned or inherited?
Researchers have previously shown that a person’s IQ is highly influenced by genetic factors, and have even identified certain genes that play a role. They’ve also shown that performance in school has genetic factors.
Do twins have similar IQ?
Researchers found that the twins had “substantial differences” in their IQ. Tests revealed that the adopted twin had an IQ 16 points lower than her long-lost sister. This contradicts existing research that says identical twins usually have no more than 7 points difference in their IQ.
Can one twin have ADHD and the other not?
Indeed, it is possible for one ADHD twin to have an additional major disorder while the other does not. Please keep in mind that even though you have twins, they are different people.
Are twins slow learners?
A:Twins are not slow learners. It has been observed that they become a self-sufficient pair, communicating between themselves very effectively, through gesture and speech.
In adolescence, twins were rated by parents as more aggressive. These studies suggest that twins may be at risk for poorer social interactions in early and middle childhood.
Twins will have better communication skills and less sibling rivalry than other children, a study shows. ‘Multiple’ siblings will have closer bonds than siblings of different ages and are likely to be best friends until adulthood, experts say.
How common is it for both twins to have autism?
Studies in identical twins have shown that autism has a strong genetic basis: If one identical twin has autism, the other one has it, too, as much as 90 percent of the time. The new work supports these estimates: In 64 of the 78 twin pairs, both twins have an autism diagnosis.