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Gestational age: 5 weeks and 0 days until 5 weeks and 6 days old. 36–42 days from last menstruation. Embryonic age: Week nr 4. 3 weeks old. 22–28 days from fertilization. The embryo measures 4 mm (1 ⁄ 8 in) in length and begins to curve into a C shape. The heart bulges, further develops, and begins to beat in a regular rhythm.
There is a positive relationship between mass at birth and length of gestation in eutherian mammals. [31] Larger mammals are more likely to produce a well-developed neonate than small mammals. Large mammals develop at an absolute slower rate compared to small mammals.
4 weeks Day 15 [33] Day 9 Primitive heart function can be detected: 5 weeks, 5 days [33] Day 26 [33] Day 20 Fetal stage begins 10 weeks, 1 day [33] 8 weeks, 1 day [33] 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 [34]: 108 36–37 weeks
Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). [1] It is typical for mammals, but also occurs for some non-mammals. Mammals during pregnancy can have one or more gestations at the same time, for example in a multiple birth. [2]
In developed countries and at facilities where expert neonatal care is available, it is considered from 22 completed weeks (usually about 154 days) of gestation (the time when birth weight is normally 500 g) to 7 completed days after birth. [3] In many of the developing countries the starting point of this period is considered 28 completed ...
There is also considerable variability in this interval, with a 95% prediction interval of the ovulation of 9 to 20 days after menstruation even for an average woman who has a mean LMP-to-ovulation time of 14.6. [9] In a reference group representing all women, the 95% prediction interval of the LMP-to-ovulation is 8.2 to 20.5 days. [8]
[5] There was a 44% decline in the maternal death rate between 1990 and 2015. However, 830 women died every day in 2015 from causes related to pregnancy or childbirth and for every woman who dies, 20 or 30 encounter injuries, infections or disabilities. Most of these deaths and injuries are preventable.
There is no sharp limit of development, age, or weight at which a fetus automatically becomes viable. [21] According to data from 2003 to 2005, survival rates are 20–35% for babies born at 23 weeks of gestation (5 + 3 ⁄ 4 months); 50–70% at 24–25 weeks (6 – 6 + 1 ⁄ 4 months); and >90% at 26–27 weeks (6 + 1 ⁄ 2 – 6 + 3 ⁄ 4 ...