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fetus    音标拼音: [f'itəs]
n. 胎儿

胎儿

fetus
n 1: an unborn or unhatched vertebrate in the later stages of
development showing the main recognizable features of the
mature animal [synonym: {fetus}, {foetus}]

Fetus \Fe"tus\ (f[=e]"t[u^]s), n.; pl. {Fetuses}
(f[=e]"t[u^]s*[e^]z). [L. fetus, foetus, a bringing forth,
brood, offspring, young ones, cf. fetus fruitful, fructified,
that is or was filled with young; akin to E. fawn a deer,
fecundity, felicity, feminine, female, and prob. to do, or
according to others, to be.]
The young or embryo of a vertebrate animal in the womb, or in
the egg; often restricted to the later stages in the
development of viviparous and oviparous animals. showing the
main recognizable features of the mature animal, {embryo}
being applied to the earlier stages. [Written also
{f[oe]tus}.]
[1913 Webster]


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  • Fetus - Wikipedia
    In human prenatal development, fetal development begins from the ninth week after fertilization (which is the eleventh week of gestational age) and continues until the birth of a newborn
  • Fetal development by week: Your baby in the womb | BabyCenter
    Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images At the start of this week, you ovulate Your egg is fertilized 12 to 24 hours later if a sperm penetrates it
  • Fetal Development: Week-by-Week Stages of Pregnancy
    Fetal development is how a fetus grows during pregnancy It begins at conception and ends at birth Many changes occur to the fetus and the pregnant person in this time
  • Fetus | Growth, Development, Nutrition | Britannica
    fetus, the unborn young of any vertebrate animal, particularly of a mammal, after it has attained the basic form and structure typical of its kind A brief treatment of the fetus follows For more information on the human fetus, see pregnancy
  • Fetal development: The first trimester - Mayo Clinic
    At the 11th week of pregnancy, or the ninth week after conception, your baby now is called a fetus At this point in pregnancy, the face is broad, the eyes widely separated, the eyelids fused, and the ears are set low on the side of the head
  • Stages of Fetal Development - The Merck Manuals
    By 12 weeks of pregnancy: The fetus fills the entire uterine cavity As the pregnancy continues, the uterus enlarges as the fetus grows By about 14 weeks: The sex can be identified on ultrasound By about 16 to 20 weeks: Typically, the pregnant woman can feel the fetus moving
  • Human Embryonic and Fetal Development: Stages and Milestones Explained . . .
    Human embryonic and fetal development is a fascinating journey that transforms a single cell into a fully formed fetus This diagram illustrates the key stages from fertilization to 20 weeks of fetal development, providing a clear visual guide for understanding this process
  • The Stages of Fetal Development - Human Life International
    There are two ways to measure what stage of development a baby is in: fertilization age and gestational age These terms can be somewhat confusing since they are based upon different starting points Fertilization age is calculated from the date of conception onwards
  • Anatomy: Fetus in Utero - Johns Hopkins Medicine
    A thin-walled sac that surrounds the fetus during pregnancy The sac is filled with liquid made by the fetus (amniotic fluid) and the membrane that covers the fetal side of the placenta (amnion)
  • Embryo vs. Fetus: How to Tell Them Apart - Verywell Health
    Key Takeaways An embryo is the early stage of development and lasts from week five to week 10 of pregnancy A fetus is the later stage of development and lasts from the end of week 10 until birth





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