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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 development of the embryo and fetus from fertilization to birth, and the terminology and factors that affect it. Find out how prenatal development differs in humans and other animals, and what can go wrong during this process.
Fundal height, or McDonald's rule, is a way to assess fetal growth and development during pregnancy. It is measured from the top of the uterus to the pubic symphysis and roughly corresponds to gestational age between 16 and 36 weeks.
Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head to the bottom of the buttocks. It can be used to estimate gestational age, which is the time from the first day of the last menstrual period, but it may vary depending on maternal factors and other parameters.
Learn about the process of growth to maturity from fertilization to adulthood, and the biological milestones and factors that influence it. Explore the stages of prenatal development, from zygote to fetus, and the maternal influences during pregnancy.
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.
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