Early Childhood Longitudinal Studies–Birth Cohort
The ECLS-B is a longitudinal study supported by the National Center for Education
Statistics (NCES), within the U.S. Department of Education. The purpose of the ECLS-B
is to provide researchers information about children’s development, along with variables
that might influence prekindergarteners’ development, especially as they relate to school
readiness. In our article, we report a secondary analysis of the ECLS-B national study of
children born in 2001. The first data collection was conducted near the time of the chil-
dren’s 9-month birthdays, with an age range of 6 to 22 months. Data were obtained from