Which statement correctly describes the fetal development process?

Which statement correctly describes the fetal development process?
○ The fetus undergoes the most rapid weight gain during the first trimester.
○ The fetus takes an average of 30 weeks to mature after conception.
○ Fetal organ systems develop at a steady rate throughout pregnancy.
○ To ensure proper growth, a fertilized egg must implant in the wall of the uterus.