<qa>  What is the NICHD Neonatal Research Networks study?Interest in and availability of cocaine, marijuana, and opiates have complicated long-term investigations into the effects of the widespread recreational use of easily accessible substances like alcohol and tobacco. It remains impossible to determine in single site, small number studies what effects may be related to the use of a specific drug. By accessing the large multi-site population of newborn infants and their mothers available in the NICHD Neonatal Research Network, this study is evaluating the short- and long-term effects of mothers cocaine andor opiate use during pregnancy on their term or preterm infants. 