The Infant Assessment Unit (IAU) was part of the Longitudinal Cohort Study. The objective of the IAU was to observe how prenatal and postnatal conditions affect the health and cognitive functioning of infants during the first year of life. Consisting of several instruments, the IAU sought to measure infant cognition and quantify the experiences of the sampled infants from Cohort 0 during their first 12 months of life. Additionally, the IAU examined the circumstances surrounding the mother's pregnancy and the subsequent care received by the infant. The IAU was administered to subjects or primary caregivers in Cohort 0 only in Wave 1 of the LCS.
The Maternal and Infant Health Survey (MIH) (PDF 3.2MG) was included in the IAU and was adapted from the National Maternal and Infant Health Survey. The MIH was primarily concerned with the prenatal conditions surrounding the subject's birth. It also collected information on the infant's delivery and health for the first six months of life. It was administered to the subject's primary caregiver.