A significant percentage of Mexican-American children who matched their white counterparts in cognitive growth at 9 months old had fallen behind by the time they reached age 2, according to.
For the study, published in the May issue of the Hispanic Journal of Behavioral Sciences, lead author Bruce Fuller, a professor of education and public policy, tracked the development of about 950 Mexican-American children and 3,600 children of native-born white mothers.
About half of white toddlers showed strong cognitive growth by age 2, compared with 22 percent of Mexican-American toddlers. A quarter of Mexican-American and white youngsters had poor cognitive growth. Other research has found that based on such measures as social and emotional growth and physical health, young Mexican-American children are similar to white children.
A version of this article appeared in the April 22, 2015 edition of Education Week as English-Language Learners