Ms. Mckoy you asked a question, you asked "what stage in pregnancy does drug use impact the fetus the most?" so I went searching and I found this website called Merck Manuals. This website stated that, "The fetus is particularly vulnerable to birth defects between the 3rd and the 8th week after fertilization, when its organs are developing. Drugs reaching the fetus during this stage may have no effect, or they may cause a miscarriage, an obvious birth defect, or a permanent but subtle defect that is noticed later in life. Drugs taken after organ development is complete are unlikely to cause obvious birth defects, but they may alter the growth and function of normally formed organs and tissues."
Michael R. Foley, MD , . "Drug Use During Pregnancy ." Merck Manuals May 2007: 1. Web. 29 Mar 2011. <http://www.merckmanuals.com/home/au/sec22/ch259/ch259a.html>.
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