Maternal active smoking can cause fetal growth restriction, pre-term delivery and low birth weight. Some specific problems that a mother's smoking can cause are orofacial clefts, e.g. cleft palate, and a reduction of lung function in infants. We also know that there is a causal link between maternal smoking during and after pregnancy and sudden infant death syndrome.
U.S. Department of Health and Human Services. The Health Consequences of Smoking – 50 years of Progress: A Report of the Surgeon General. Atlanta, GA. Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health, 2014.