After the point of fertilization, the fused product of the female and male gamete is referred to as a zygote or fertilized egg. The woman's abdomen will transform in shape as it drops due to the fetus turning in a downward position ready for birth. At the beginning of the fetal stage, the risk of miscarriage decreases sharply. Although the breasts have been developing internally since the beginning of the pregnancy, most of the visible changes appear after this point. Breast tenderness is common during the first trimester, and is more common in women who are pregnant at a young age. Adding the estimated gestational age at childbirth to the above time point. At left anterior view with months labeled, at right lateral view labeling the last 4 weeks.
Relative size in 1st month simplified illustration Relative size in 3rd month simplified illustration Relative size in 5th month simplified illustration Relative size in 9th month simplified illustration Maternal changes Main article: Breast tenderness is common during the first trimester, and is more common in women who are pregnant at a young age. Most births are successful vaginal births, but sometimes complications arise and a woman may undergo a cesarean section. This is about a week to ten days after fertilization. Sometimes, timing may also use the fertilization age which is the age of the embryo. Third trimester Pregnant woman in third trimester of pregnancy last month The uterus expands making up a larger and larger portion of the woman's abdomen. The umbilical cord is the connecting cord from the embryo or fetus to the placenta. 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 ultrasound , and 16 days when estimated directly by last menstrual period. Early obstetric ultrasound , comparing 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 periods , and using the mean gestational age of other embryos or fetuses of the same size. Estimated date of confinement Due date estimation basically follows two steps: Alternatively there are mobile apps , which essentially always give consistent estimations compared to each other and correct for leap year , while pregnancy wheels made of paper can differ from each other by 7 days and generally do not correct for leap year. Childbirth Childbirth, referred to as labor and delivery in the medical field, is the process whereby an infant is born. This is time of implantation, when the future fetus attaches to the lining of the uterus. Maternal physiological changes in pregnancy Breast changes as seen during pregnancy. Fetus at 18 weeks after fertilization. Start of gestational age According to American Congress of Obstetricians and Gynecologists , the main methods to calculate gestational age are: During the time immediately after birth, both the mother and the baby are hormonally cued to bond, the mother through the release of oxytocin , a hormone also released during breastfeeding. Childbirth on average occurs at a gestational age of days 40 weeks , which is therefore often used as a standard estimation for individual pregnancies. Gestational age of 20 weeks. Although the fetus begins to move during the first trimester, it is not until the second trimester that movement, often referred to as " quickening ", can be felt. At the beginning of the fetal stage, the risk of miscarriage decreases sharply. The areolae are larger and darker. Sex organs begin to appear during the third month of gestation. Gestational age of 6 weeks. Cell division begins approximately 24 to 36 hours after the male and female cells unite. The uterus, the muscular organ that holds the developing fetus, can expand up to 20 times its normal size during pregnancy.
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