Title: Reproductive Process
Headings: Egg to Embryo to Fetus: The Reproduction and Development Process
Egg to Embryo to Fetus: The Reproduction and Development Process
Vagina
1. Fertilization: A Sperm and an Egg Form a Zygote
2. The Zygote Becomes an Embryo: Development Prior to and During Implantation
3. In Eight Weeks, the Embryo Develops; By the End of Week 10 It Becomes a Fetus
4. Fetal Development Ends with Labor, a Three-Stage Process
5. Humans Must Develop Male or Female Gonads and Genitalia to be Capable of Reproduction
External Sources

Content: They begin to curve and fold and to form an oblong body. By week 4, the embryo has a distinct head and tail and a beating heart. Over the next six weeks, limbs, eyes, brain regions, and vertebrae form. Primitive versions of all body systems appear. By the end of week 10, the embryo is a fetus. ( Note: Pregnancy is often measured in terms of gestational age—age of the fetus starting with the first day of a woman’s last menstrual period—and embryonic or fetal age—actual age of the growing fetus. We are referring to the gestational age of the fetus.) 4. Fetal Development Ends with Labor, a Three-Stage Process
From week 10 of pregnancy, the fetus grows inside the uterus, fueled by nutrient-rich blood supplied by the umbilical cord.