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Use this interactive prenatal timeline to learn about the stages of pregnancy from conception to birth. This versatile tool features movies, images, facts, and even quiz questions.
This page is organised to show a week by week human timeline of development features and approximate timing of key events with more detailed information about specific events in different systems. For a less detailed timeline see week by week.
Animals Including Humans Y5. Pupils consider the life cycle of humans. They explain the stages of development of a human embryo and compare its gestation period to those of other mammals, recording their data in tables and creating bar and line graphs.
View a customizable human prenatal development timeline ranging from fertilization to birth. Also includes quizzes, images, and movies.
A developing human is referred to as an embryo during weeks 3–8, and a fetus from the ninth week of gestation until birth. In this section, we’ll cover the pre-embryonic and embryonic stages of development, which are characterized by cell division, migration, and differentiation.
Key learning points. A zygote divides to become an embryo, which then develops into a foetus made of different cells and tissues. The human gestation period is about 40 weeks. The foetus grows in an amniotic sac which is filled with amniotic fluid for protection.
Gestational age is the time that has passed since the onset of the last menstruation, which generally or as standard occurs 2 weeks before the actual fertilization. Embryonic age, in contrast measures the actual age of the embryo or fetus from the time of fertilization.
