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A typical precocial mammal has a gestation period almost four times longer than a typical altricial mammal of the same body size. [20] Precocial mammal species generally have greater adult body weights than altricial mammals as precocial mammals have markedly longer gestation periods than altricial mammals. [21]
Human pregnancy can be divided into three trimesters, each approximately three months long: the first, second, and third trimester. 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]
For births that occur in hospitals the WHO recommends a hospital stay of at least 24 hours following an uncomplicated vaginal delivery and 96 hours for a Cesarean section. Looking at length of stay (in 2016) for an uncomplicated delivery around the world shows an average of less than 1 day in Egypt to 6 days in (pre-war) Ukraine.
For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...
Women who have never carried a pregnancy more than 20 weeks are referred to as nulliparous. [23] A pregnancy is considered term at 37 weeks of gestation. It is preterm if less than 37 weeks and post-term at or beyond 42 weeks of gestation.
A spontaneous vaginal delivery (SVD) occurs when a pregnant woman goes into labor without the use of drugs or techniques to induce labor and delivers their baby without forceps, vacuum extraction, or a cesarean section. [1] An induced vaginal delivery is a delivery involving labor induction, where drugs or manual techniques are used to initiate ...
Prolonged labor is the inability of a woman to proceed with childbirth upon going into labor. [1] Prolonged labor typically lasts over 20 hours for first time mothers, and over 14 hours for women that have already had children. [1] Failure to progress can take place during two different phases; the latent phase and active phase of labor. [1]
Mother with newborn baby. The postpartum (or postnatal) period begins after childbirth and is typically considered to last for six weeks. [1] There are three distinct phases of the postnatal period; the acute phase, lasting for six to twelve hours after birth; the subacute phase, lasting six weeks; and the delayed phase, lasting up to six months.