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  2. Timeline of human prenatal development - Wikipedia

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

    Embryonic age: Week nr 1. 0 (whole) weeks old. 1–7 days from fertilization. Fertilization of the ovum to form a new human organism, the human zygote. (day 1 of fertilization [1]) The zygote undergoes mitotic cellular divisions, but does not increase in size. This mitosis is also known as cleavage.

  3. Crown-rump length - Wikipedia

    en.wikipedia.org/wiki/Crown-rump_length

    An ultrasound showing an embryo measured to have a crown-rump length of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day. Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump).

  4. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    4 weeks Day 15 [32] Day 9 Primitive heart function can be detected: 5 weeks, 5 days [32] Day 26 [32] Day 20 Fetal stage begins 10 weeks, 1 day [32] 8 weeks, 1 day [32] 7 weeks, 2 days First trimester ends 13 weeks 11 weeks 10 weeks Second trimester ends 26 weeks 24 weeks 23 weeks Childbirth: 39–40 weeks 37–38 weeks [33]: 108 36–37 weeks

  5. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    In human pregnancy, prenatal development is also called antenatal development. The development of the human embryo follows fertilization, and continues as fetal development. By the end of the tenth week of gestational age, the embryo has acquired its basic form and is referred to as a fetus. The next period is that of fetal development where ...

  6. A week-by-week guide to common pregnancy symptoms - AOL

    www.aol.com/news/week-week-guide-common...

    Pregnancy Symptoms Week 1. It's a bit of a mind-bender, but you aren't actually pregnant during what doctors call "week one" of pregnancy. Instead, week one starts on the first day of your last ...

  7. Fundal height - Wikipedia

    en.wikipedia.org/wiki/Fundal_height

    Illustration of fundal height at various points during pregnancy. Fundal height, or McDonald's rule, is a measure of the size of the uterus used to assess fetal growth and development during pregnancy. It is measured from the top of the mother's uterus to the top of the mother's pubic symphysis.

  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. HCG Levels Chart: Are They Necessary While Pregnant? - AOL

    www.aol.com/news/hcg-levels-chart-necessary...

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