Title: Stages of fetal growth and development
Headings: Stages of fetal growth and development
Stages of fetal growth and development
Stages of fetal growth and development

Content: 9 Weeks to Birth
3. LUNAR MONTH
4. • Fertilization to 2 weeks of embryonic growth• Implantation is complete• Primary chorionic villi forming• Embryo develops into two cell layers (trophoblast and blastocyst)• Amniotic cavity appears
5. LUNAR MONTH
6. • 3 to 6 weeks of embryonic growth• At the end of 6 weeks of growth, the embryo is approximately ½ inch (1.3 cm) long• Arm and leg buds are visible; arm buds are more developed with finger ridges beginning to appear• Rudiments of the eyes, ears, and nose appear
7. • Lung buds are developing• Primitive intestinal tract is developing• Primitive cardiovascular system is functioning• Neural tube, which forms the brain and spinal cord, closes by the fourth week
8. LUNAR MONTH
9. • 7 to 10 weeks of growth• The middle of this period (9 weeks) marks the end of the embryonic period and the beginning of the fetal period• At the end of 10 weeks of growth, the fetus is approximately 2½ inches (6.3 cm) from crown to rump and weighs ½ oz (14 g)• Appearance of external genitalia• By the middle of this month, all major organ systems have formed
10. • The membrane over the anus has broken down• The heart has formed four chambers (by seventh week)• The fetus assumes a human appearance• Bone ossification begins• Rudimentary kidney begins to secrete urine
11.