Which of the following time points is correct? A. An infant is premature if born before 36 weeks. B. Most birth defects occur in the first trimester, usually within the first eight weeks. C. A fetus...

Which of the following time points is correct?

A. An infant is premature if born before 36 weeks.

B. Most birth defects occur in the first trimester, usually within the first eight weeks.

C. A fetus is post-term after week 42.

D. The perinatal period is from the 28th week of pregnancy until birth.