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Gravida indicates the number of times a female is or has been pregnant, regardless of the pregnancy outcome. [4] A current pregnancy, if any, is included in this count. A multiple pregnancy (e.g., twins, triplets, etc.) is counted as 1.
Twin. Identical twins Mark and Scott Kelly, both former NASA astronauts. Twins are two offspring produced by the same pregnancy. [1] Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a ...
Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth ), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. [1] Seventy-five percent of monozygotic twin pregnancies are monochorionic; the remaining 25% are ...
A multiple birth is the culmination of one multiple pregnancy, wherein the mother gives birth to two or more babies. A term most applicable to vertebrate species, multiple births occur in most kinds of mammals, with varying frequencies. Such births are often named according to the number of offspring, as in twins and triplets.
Monoamniotic twins are identical or semi-identical twins that share the same amniotic sac within their mother's uterus. [1] Monoamniotic twins are always monochorionic and are usually termed Monoamniotic-Monochorionic ("MoMo" or "Mono Mono") twins. [1] [2] They share the placenta, but have two separate umbilical cords.
Superfetation (also spelled superfoetation – see fetus) is the simultaneous occurrence of more than one stage of developing offspring in the same animal. [1] [2] [3] In mammals, it manifests as the formation of an embryo from a subsequent menstrual cycle, while another embryo or fetus is already present in the uterus.
Gestational age: 7 weeks and 0 days until 7 weeks and 6 days old. 50–56 days from last menstruation. Embryonic age: Week nr 6. 5 weeks old. 36–42 days from fertilization. The embryo measures 13 mm ( 1⁄2 in) in length. Lungs begin to form. The brain continues to develop.
Pregnancy is the time during which one or more offspring develops ( gestates) inside a woman 's uterus (womb). [4] [13] A multiple pregnancy involves more than one offspring, such as with twins. [14]
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