A Newborn Is Diagnosed with a Heart Defect

A newborn is diagnosed with a heart defect.The mother says,"I tried to be so careful while I was pregnant.What happened?" What should the nurse consider before responding?

A) Fetal heart development begins at the third week.
B) The fetal heart begins to beat in the sixth week.
C) Many women do not realize they are pregnant until after organogenesis has begun.
D) Teratogens begin to affect cardiac development as early as week eight of fetal development.
E) No specific substances have been known to affect the development of the fetal heart.