RT Book, Section A1 Balken, Elizabeth A1 Leen-Mitchell, Marsha A1 Martinez, Lynn P. A1 Robertson, Julia A. A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 7018001 T1 Chapter 183. Environmental Causes of Birth Defects T2 Rudolph's Pediatrics, 22e YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-149723-7 LK accesspediatrics.mhmedical.com/content.aspx?aid=7018001 RD 2024/04/25 AB The definition of a teratogenic agent (an exposure, external to the fetal genome, that induces structural or functional alterations during prenatal development) suggests that the clinicians’ first encounter may be well after the exposure has occurred. Knowledge of the principles of teratology can direct diagnostic and treatment approaches to a child with dysfunction or dysmorphology of unknown etiology and can be instrumental in guiding initial evaluations as well as physician–patient–parent interactions.