27: Human Development and Pregnancy Last updated Jun 23, 2019 Save as PDF 26.6F: Female Sexual Response 27.1: Overview of Pregnancy and Human Development Page ID7926 ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy27.10: Changes to the Mother's Body During Pregnancy27.10A: Anatomical Changes27.10B: Metabolic Changes27.10C: Physiological Changes27.10D: Exercise and Pregnancy27.1: Overview of Pregnancy and Human Development27.1A: Introduction to Pregnancy and Human Development27.2: First Week of Development27.2A: Fertilization27.2B: Cleavage of the Zygote27.2C: Blastocyst Formation27.2D: Implantation27.3: Second Week of Development27.3A: Trophoblast Development27.3B: Bilaminar Embryonic Disc Development27.3C: Amnion Development27.3D: Yolk Sac Development27.3E: Sinusoid Development27.3F: Development of the Extraembryonic Coelom27.4: Third Week of Development27.4A: Gastrulation27.4B: Neurulation27.4C: Somite Development27.4D: Development of the Cardiovascular System27.4E: Chorionic Villi and Placental Development27.5: Fourth Week of Development27.5A: Fourth Week of Development27.6: Fifth Through Eighth Weeks of Development27.6A: Fifth Through Eighth Weeks of Development27.7: Birth (Parturition)27.7A: Onset of Labor27.7B: Stages of Labor27.7C: Adjustments of the Infant at Birth27.8: Lactation27.8A: Physiology of Lactation27.9: The Fetal Period27.9A: Fetal Development27.9B: Teratogens27.9C: Prenatal Diagnostic Tests