Gestational age of 10 weeks. Although the breasts have been developing internally since the beginning of the pregnancy, most of the visible changes appear after this point. Sometimes, timing may also use the fertilization age which is the age of the embryo. The fusion of male and female gametes usually occurs following the act of sexual intercourse. Fetus at 38 weeks after fertilization.
The uterus, the muscular organ that holds the developing fetus, can expand up to 20 times its normal size during pregnancy. They recommend that neonates be allowed to bond with the mother during their first two hours after birth, the period that they tend to be more alert than in the following hours of early life. 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. During this time, cells begin to differentiate into the various body systems. The fusion of male and female gametes usually occurs following the act of sexual intercourse. Start of gestational age According to American Congress of Obstetricians and Gynecologists , the main methods to calculate gestational age are: Although the fetus begins to move during the first trimester, it is not until the second trimester that movement, known as quickening , can be felt. Fetus at 38 weeks after fertilization. Fetal movement can become strong and be disruptive to the woman. Estimated date of confinement Due date estimation basically follows two steps: Head engagement , where the fetal head descends into cephalic presentation , relieves pressure on the upper abdomen with renewed ease in breathing. The umbilical cord is the connecting cord from the embryo or fetus to the placenta. Also during this time, there is development of structures important to the support of the embryo, including the placenta and umbilical cord. 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. Fertilization conception is sometimes used as the initiation of pregnancy, with the derived age being termed fertilization age. The woman's abdomen will transform in shape as it drops due to the fetus turning in a downward position ready for birth. Although the breasts have been developing internally since the beginning of the pregnancy, most of the visible changes appear after this point. It is common for some women not to feel the fetus move until much later. Final weight gain takes place, which is the most weight gain throughout the pregnancy. The placenta connects the developing embryo to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply. During the second trimester, most women begin to wear maternity clothes. Many symptoms and discomforts of pregnancy like nausea and tender breasts appear in the first trimester. This is about a week to ten days after fertilization. For instance, the enlarged uterus may impede blood flow by compressing the vena cava when lying flat, which is relieved by lying on the left side.
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