A nurse is reinforcing teaching about fetal development with a group of women who are pregnant. Which of the following statements should the nurse include in the teaching?

“The maternal-fetal circulation is established at 12 weeks of gestation.”

"Very fine hairs, called lanugo, cover your baby's entire body by week 36 of pregnancy.”

"You will first feel your baby move by week 24 of pregnancy.”

“The sex of the baby is determined by week 8 of pregnancy.”