The pregnant patient who is at 14 weeks' gestation asks the nurse why the doctor used to call her baby an embryo, and now calls it a fetus. What is the best answer to this question?
1. "A fetus is the term used from the ninth week of gestation and onward."
2. "We call a baby a fetus when it is larger than an embryo."
3. "An embryo is a baby from conception until the eighth week."
4. "The official term for a baby in utero is really zygote."
1
Rationale 1: The fetal stage begins in the ninth week.
Rationale 2: The embryonic stage ends with the eighth week, regardless of size.
Rationale 3: The pre-embryonic stage is from conception until day 15.
Rationale 4: A zygote is a fertilized ovum.
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