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Prenatal development is the development of the embryo and fetus before birth. Learn about fertilization, implantation, embryogenesis, fetal development, and the factors that affect prenatal growth and health.
Pregnancy is the time during which one or more offspring develops inside a woman's uterus. Learn about the causes, symptoms, complications, and stages of pregnancy, as well as the terms and statistics related to it.
Learn about the stages of human embryonic and fetal development from fertilization to birth, with a table of gestational and embryonic ages. See illustrations of the changes in size, shape, and organs of the embryo and fetus at different weeks.
Learn about the processes of fertilization, cleavage, blastulation, gastrulation, neurulation and organogenesis that occur during the first eight weeks of human embryogenesis. See diagrams, images and references of the stages of human embryo formation.
Learn about the process of growth to maturity from fertilization to adulthood, and the stages of prenatal and postnatal development. Find out how genetic, hormonal, environmental and other factors influence human growth and development.
Implantation is the stage in mammalian embryonic development when the blastocyst attaches to the uterine wall. In humans, implantation occurs around days 5–9 after fertilization, and involves five stages: migration and hatching, pre-contact, attachment, adhesion, and invasion.
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