A woman who is 16 weeks pregnant asks the nurse, "Is it possible to tell by ultrasound if the baby is a boy or girl yet?" The best answer is
a. "A baby's sex is determined as soon as conception occurs."
b. "The baby has developed enough that we can determine the sex by examining the
genitals through ultrasound."
c. "Boys and girls look alike until approximately 20 weeks after conception, and
then they begin to look different."
d. "It might be possible to determine your baby's sex, but the external organs look
very similar right now."
B
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A This is a true statement, but the external genitalia are similar in appearance until
approximately the 12th week.
B Although gender is determined at conception, the external genitalia of males and
females look similar through the 9th week. By the 12th week, the external
genitalia are distinguishable as male or female.
C The external genitalia are similar in appearance until approximately 12 weeks,
not 20 weeks.
D The external genitalia are different at approximately week 12.
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