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: Fertilization usually occurs about two weeks before the next expected menstrual period. Many symptoms and discomforts of pregnancy like nausea and tender breasts appear in the first trimester.
Most women feel more energized in this period, and begin to put on weight as the symptoms of morning sickness subside and eventually fade away. 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. 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. Fertilization usually occurs about two weeks before the next expected menstrual period. During pregnancy, the woman undergoes many physiological changes, which are entirely normal, including behavioral , cardiovascular , hematologic , metabolic , renal , and respiratory changes. Gestational age of 10 weeks. Maternal physiological changes in pregnancy Breast changes as seen during pregnancy. The development of the mass of cells that will become the infant is called embryogenesis during the first approximately ten weeks of gestation. Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. Levels of progesterone and oestrogens rise continually throughout pregnancy, suppressing the hypothalamic axis and therefore also the menstrual cycle. Weeks 13 to 28 of the pregnancy are called the second trimester. Childbirth Childbirth, referred to as labor and delivery in the medical field, is the process whereby an infant is born. 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. Increases in blood sugar, breathing, and cardiac output are all required. Most births are successful vaginal births, but sometimes complications arise and a woman may undergo a cesarean section. It is also during the third trimester that maternal activity and sleep positions may affect fetal development due to restricted blood flow. Human fertilization Fertilization and implantation in humans Through an interplay of hormones that includes follicle stimulating hormone that stimulates folliculogenesis and oogenesis creates a mature egg cell , the female gamete. Studies show that skin-to-skin contact between a mother and her newborn immediately after birth is beneficial for both the mother and baby. Cell division begins approximately 24 to 36 hours after the male and female cells unite. Sometimes, timing may also use the fertilization age which is the age of the embryo. Many symptoms and discomforts of pregnancy like nausea and tender breasts appear in the first trimester. Although the breasts have been developing internally since the beginning of the pregnancy, most of the visible changes appear after this point. Gestational age of 6 weeks. The blastocyst arrives at the uterus and attaches to the uterine wall, a process known as implantation. After about ten weeks of gestational age, the embryo becomes known as a fetus. Fetus at 8 weeks after fertilization. At left anterior view with months labeled, at right lateral view labeling the last 4 weeks.
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