Subject
*Maternal Exposure; *Rural Population; Biological Markers – Urine; Biomarkers/*urine; Child Development – Drug Effects; Child Development/*drug effects; Cotinine – Blood; Cotinine – Urine; Cotinine/*blood/*urine; Environmental Exposure – Analysis; Environmental Exposure/*analysis; Female; Humans; Male; Maternal Exposure; Motor Skills; Motor Skills/*physiology; Passive Smoking – Adverse Effects; Passive Smoking – Analysis; Pregnancy; Prenatal Exposure Delayed Effects; Prenatal Exposure Delayed Effects/*urine; Rural Population; Tobacco – Adverse Effects; Tobacco Smoke Pollution/*adverse effects/*analysis; Tobacco/*adverse effects