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Pregnancy Symptoms Week 6. TODAY Illustration/Getty Images. Your body: As hormones cause food to move more slowly through your body, ... 25 weeks pregnant baby size (Photo Illustration/Getty Images)
Gestational age: 6 weeks and 0 days until 6 weeks and 6 days old. 43–49 days from last menstruation. Embryonic age: Week nr 5. 4 weeks old. 29–35 days from fertilization. The embryo measures 8 mm (0.31 in) in length and weighs about 1 gram. [4] Optic vesicles and optic cups form the start of the developing eye. Nasal pits form.
Human embryonic development covers the first eight weeks of development, which have 23 stages, called Carnegie stages. At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs.
The gestational sac is spherical in shape, and is usually located in the upper part (fundus) of the uterus.By approximately nine weeks of gestational age, due to folding of the trilaminar germ disc, the amniotic sac expands and occupy the majority of the volume of the gestational sac, eventually reducing the extraembryonic coelom (the gestational sac or the chorionic cavity) to a thin layer ...
English: A diagram showing the brain and major nerves of a 6 week old human fetus. 1. olfactory 2. optic 3. oculomotor 4. trochlear 5. trigeminal sensory 6. trigeminal motor 7. abducens 8. facial 9. vestibulocochlear 10. glossopharyngeal 11. vagus 12. cranial accessory 13. spinal accessory 14. hypoglossal. 15. cervical I, II, III and IV
Weeks 17 to 25 (3.6 to 6.6 months) [ edit ] A woman pregnant for the first time ( nulliparous ) typically feels fetal movements at about 21 weeks, whereas a woman who has given birth before will typically feel movements by 20 weeks. [ 13 ]