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Stretch marks Breast tenderness is common during the first trimester, and Cildrens more common in women who are pregnant at a young age. It usually begins to fade several months after giving birth. Timeline The chronology of pregnancy is, unless otherwise specified, generally given as gestational agewhere the starting point is Why Childrens Development May Not Follow The Expected beginning of the woman's last menstrual period LMPor the corresponding age of the gestation this web page estimated by a more accurate method if available. Sometimes, timing may Children use the fertilization age which is the age of the embryo. Start of gestational age The American Congress of Obstetricians and Gynecologists recommend the following methods to calculate gestational age: [29] Directly calculating the days since the beginning of the last menstrual period.
Early obstetric ultrasoundcomparing the size of an embryo or fetus to that of a reference group of pregnancies of known gestational age such as calculated from last menstrual periodsand using the mean gestational age of other embryos or fetuses of the same size. If the gestational age as calculated from an early ultrasound is contradictory to the one calculated directly from the last menstrual period, it is still the one from the early ultrasound that is used for the rest of the pregnancy. Due date estimation basically follows two steps: Determination of which time point is to be used as origin for gestational ageas described in the section above. Adding the estimated gestational age at childbirth to the above time point.
Childbirth on average occurs at a gestational age of days 40 weekswhich is therefore often used as a standard estimation for individual pregnancies. Naegele's rule is a standard way of calculating the due date for a pregnancy when assuming a gestational age of days at childbirth. Expeced
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The rule estimates the expected date of delivery EDD by adding a year, subtracting three months, and adding seven days to the origin of gestational age. Alternatively there are mobile appswhich essentially always give Devepopment estimations compared to each other and correct for leap yearwhile pregnancy wheels made of paper can differ from each other by 7 days and generally do not correct for leap year. A study of singleton live births came to the result that childbirth has a standard deviation of 14 days when gestational age is estimated by first trimester ultrasoundand 16 days when estimated directly by last menstrual period. Fertilization is the event where the egg cell fuses with the male gamete, spermatozoon.
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After the point of fertilization, the fused product of the female and male gamete is referred to as a zygote or fertilized egg. The fusion of female and male gametes usually occurs following the act of sexual intercourse. Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. Fertilization conception is sometimes used as the initiation of pregnancy, with the derived age being termed fertilization age. Fertilization usually occurs about two weeks before the next expected menstrual period.
A third point in time is also considered by some people to be the true beginning of a pregnancy: This is time of implantation, when the future fetus attaches to the lining of the Dsvelopment. This is about a week to ten days after fertilization. The fertilized egg, known as a zygotethen moves toward the uterus, a journey that can take up to a week to complete.
Cell division begins approximately 24 to 36 hours after the female and male cells unite. Cell division continues at a rapid rate and the cells then develop into what is known as a blastocyst. The blastocyst arrives at the uterus and attaches to the uterine wall, a process known as implantation. The development of the mass of cells that will become the infant is called embryogenesis during the first approximately ten weeks of gestation.
During this time, cells begin to differentiate into the various body systems. The basic outlines of the Expexted, body, and nervous systems are established.]
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