Premature babies can catch up by teen years

July 22, 2011

NEW YORK, July 22 By the age of 16, children born very prematurely are able to catch up to kids born at full term in their ability to identify the names of things, according to a new study.

Delicate at birth, this premature baby inside an incubator would catch up at four-year intervals. Reuters picThe results are a bit of good news among myriad reports detailing deficits in learning and cognition that are common among children born weeks or months before their due date.This leaves one on a high note, that some of these kids do well, said Dr H. Gerry Taylor, a professor of paediatrics at Case Western Reserve University, who was not involved in the study.The Canadian and US researchers compared more than 300 children born early and weighing less than three pounds to 41 children who were born after a full-length pregnancy of 37 weeks.At ages eight, 12 and 16 years, the kids took several tests to measure their IQ and language skills. At each age, the premature children had IQs 15 to 17 points lower than their full-term counterparts.On tests of word knowledge and spatial reasoning, both groups of children improved in their skills over time, but the scores of the kids born early continued to lag by similar margins.However, one examination called receptive vocabulary, in which kids are shown pictures of objects and asked to identify the correct picture for a given word revealed a different pattern.At eight years old, the premature kids scored 14 points lower on the vocabulary test than the other group. But every four years, these children closed the gap by four points, nearly catching up with the full-term kids by the time they turned 16.Taylor said that the reason premature children performed better on some tests and worse on others was likely because the risk for brain damage when babies were born early was higher for some parts of the brain and lower for others.Some areas of t! he brain sustain more insult than others, Taylor told Reuters Health.A preemies exposure to pain, oxygen and the environment can harm her immature brain.A previous study on this same group of premature children reported that their language and intellectual skills suffered through the school-age years, compared with full-term children.The findings of this latest research were encouraging, because we always focus on the negative aspects of being born prematurely, said lead author Dr Thuy Mai Luu, a paediatrician and clinical researcher at Sainte-Justine University Health Centre in Montreal.Luu added that her results showed that a subset of preemies performed normally on some language and problem-solving tests.For instance, in a word comprehension test, 17 per cent of premature children outperformed the full-term group at eight, 12 and 16 years of age. An additional 38 per cent of premature kids caught up to the full-term kids by the age of 16.On a visual problem-solving test, nearly half of the pre-term children performed just as well as the full-term kids at each age.Luus group found that the best-performing kids who were born premature tended to have mothers with higher levels of education and to come from families with a higher socioeconomic status.We dont know the mechanism, Luu said. Thats the next step: to understand why theyre doing better.One possibility is that some children are better able to repair any brain damage done as a newborn, or perhaps they had less injury to begin with.Another recent study found that children who have a delay in their speech kids who have a limited vocabulary at two years of age also catch up by the time theyre five, with no impact on their behavioural health.Taylor said the results of this study, published in the journal Paediatrics, were rare in that most other studies had reported that once deficits were established in pre-term children, they tended to remain.Its amazing that even with these areas of difficulty the children are able to compensate quite well, make use of t! heir str engths, and go on to achieve, Taylor said. Reuters