Two (2) members of the research team will collect the blood and urine samples, and transport them to M. D. Anderson since an overnight carrier is not available on the required days of collection. About 5 teaspoons of blood will be drawn and a urine sample will be collected. In addition, the height and weight of the mothers and the children will be measured. All blood and urine collected will be used only by the researchers involved in this study. If the child's mother agrees, the type(s) and levels of the pesticides detected will be provided to the child's physician for diagnostic purposes only. The data will be analyzed in a way that will help maintain confidentiality.