Final weight gain takes place, which is the most weight gain throughout the pregnancy. Breast tenderness is common during the first trimester, and is more common in women who are pregnant at a young age. The fusion of male and female gametes usually occurs following the act of sexual intercourse. Gestational age of 40 weeks. Sperm mixes with other fluids to make semen cum , which comes out of the penis during ejaculation.
Sex organs begin to appear during the third month of gestation. It is considered primitive neural activity rather than the beginning of conscious thought. The embryo develops from cells on the inside of the ball. Adding the estimated gestational age at childbirth to the above time point. Development of embryo and fetus The initial stages of human embryogenesis The sperm and the egg cell, which has been released from one of the female's two ovaries , unite in one of the two fallopian tubes. The egg hangs out for about hours, slowly moving through the fallopian tube, to see if any sperm are around. Gestational age of 20 weeks. The fusion of male and female gametes usually occurs following the act of sexual intercourse. Sperm mixes with other fluids to make semen cum , which comes out of the penis during ejaculation. 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: Common signs and symptoms of pregnancy can include: The fetus continues to grow in both weight and length, although the majority of the physical growth occurs in the last weeks of pregnancy. The ball of cells called a blastocyst gets to the uterus about 3—4 days after fertilization. After the point of fertilization, the fused product of the female and male gamete is referred to as a zygote or fertilized egg. The fetus moves regularly, and is felt by the woman. They have up to 6 days to find an egg before they die. During the second trimester, the woman's abdomen would have been upright, whereas in the third trimester it will drop down low. During the second trimester, most women begin to wear maternity clothes. 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. 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 Childbirth, referred to as labor and delivery in the medical field, is the process whereby an infant is born. Levels of progesterone and oestrogens rise continually throughout pregnancy, suppressing the hypothalamic axis and therefore also the menstrual cycle. It takes up to weeks after sex for pregnancy to happen. Gestational age of 40 weeks. At left anterior view with months labeled, at right lateral view labeling the last 4 weeks.
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