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  2. Timeline of human prenatal development - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_prenatal...

    Embryonic age: Week nr 7. 6 weeks old. 43–49 days from fertilization. The embryo measures 18 mm (3 ⁄ 4 in) in length. Fetal heart tone (the sound of the heart beat) can be heard using doppler. Nipples and hair follicles begin to form. Location of the elbows and toes are visible. Spontaneous limb movements may be detected by ultrasound.

  3. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    Nine-week-old human embryo from an ectopic pregnancy. Organogenesis is the development of the organs that begins during the third to eighth week, and continues until birth. Sometimes full development, as in the lungs, continues after birth. Different organs take part in the development of the many organ systems of the body.

  4. File:Prenatal development table.svg - Wikipedia

    en.wikipedia.org/wiki/File:Prenatal_development...

    English: Stages in Prenatal development, with weeks and months numbered by gestation. Image made in Inkscape. References are found in equivalent Wikipedia articles: Fetus; Gestational age; Human development (biology) Pregnancy; Prenatal development; Viability (fetal)

  5. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    Different terms are used to describe prenatal development, meaning development before birth. A term with the same meaning is the "antepartum" (from Latin ante "before" and parere "to give birth") Sometimes "antepartum" is however used to denote the period between the 24th/26th week of gestational age until birth, for example in antepartum ...

  6. Development of the endocrine system - Wikipedia

    en.wikipedia.org/wiki/Development_of_the...

    In addition, the fetal pancreatic islets cells are unable to sufficiently produce cAMP and rapidly degrade cAMP by phosphodiesterase necessary to secrete glucagon and insulin. [14] During fetal development, the storage of glycogen is controlled by fetal glucocorticoids and placental lactogen. Fetal insulin is responsible for increasing glucose ...

  7. Development of the human body - Wikipedia

    en.wikipedia.org/wiki/Development_of_the_human_body

    Development before birth, or prenatal development (from Latin natalis 'relating to birth') is the process in which a zygote, and later an embryo, and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote , the first stage in embryonic development which continues in fetal ...

  8. Gestation - Wikipedia

    en.wikipedia.org/wiki/Gestation

    The first trimester is from the last menstrual period through the 13th week, the second trimester is 14th–28/29th week, and the third trimester is 29/30th–42nd week. [6] Birth normally occurs at a gestational age of about 40 weeks, though it is common for births to occur from 37 to 42 weeks. [ 6 ]

  9. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    Calculating the results of various prenatal tests, (for example, in the triple test). Birth classification into for example preterm, term or postterm. Classification of infant deaths and stillbirths; Postnatally (after birth) to estimate various risk factors; Timeline of pregnancy by gestational age