The skeleton of the baby is forming and the bones are soft. Week 9 – The embryo has taken on a mini baby shape. The umbilical cord supplies oxygen and nutrients to the baby. The baby begins to move around and can be seen on ultrasound ~ movement is felt between 16 and 22 weeks. The digestive and respiratory systems are forming. Week 6 – The heart beats about 90 -110 times a minute (bpm). The heartbeat can be seen with ultrasound. Week 5 – Blood vessels begin to form and pump blood. A pregnancy test can measure human chorionic gonadotropin (hCG – a pregnancy hormone made by the placenta) and confirm pregnancy. The embryo is attached to the lining of the uterus. Week 4 – The baby is scientifically referred to as an embryo. NOTE: All of the following weeks are based on Gestational Age, or LMP. The first trimester is from week 1 to the end of week 12, the second trimester is from week 13 to the end of 26, and the third trimester is week 27 until 40 weeks. What Happens To The Baby During The First Trimester? Gestational Age starts two or more weeks before the fertilization of the egg by the sperm.įertilization Age: Fertilization Age refers to how long it has been since conception (the fertilization of the egg by the sperm).Ī healthcare provider will date a pregnancy due date 40 weeks from the first day of your last menstrual period (LMP). This term refers to how long it has been since the first day of the mother’s last menstrual period (LMP). Gestational Age: Gestational age is used by healthcare professionals to date pregnancy. During these stages, an unborn child is addressed as an embryo, fetus, or baby. There are two ways to date a pregnancy: Gestational Age and Fertilization Age. A doctor may be able to identify the sex through special tests.During each week of pregnancy, an unborn child undergoes many changes. Let’s find some understanding to the question “Is my unborn child a fetus or a baby?” Here is a look at common medical terms to explain what happens during pregnancy. For females, ovarian follicles begin forming.The fetus can swallow, the kidneys make urine, and blood begins to form in the bone marrow.The fetus is about 3 1/ 2-inches from head to rump and weighs about 1½ ounces.(14 weeks after the first day of the last normal menstrual period) The baby’s face now has a human profile.The fetus’s heartbeat can be detected electronically.The fetus begins small, random movements, too slight to be felt.Fingers and toes are distinct and have nails.The fetus is about 2 1/ 2-inches from head to rump and weighs about 1/ 2 ounce.(12 weeks after the first day of the last normal menstrual period) The neck begins to develop, and the baby’s eyelids begin to close to protect his or her developing eyes.Eyes, ears, arms and legs are identifiable.The beginnings of all key body parts are present, although they are not completely positioned in their final locations.The fetus, until now called an embryo, is about 1 1/ 4-inches long, with the head making up about half this size.(10 weeks after the first day of the last normal menstrual period) The trunk of the baby's body is beginning to straighten.The shell-shaped parts of the baby's ears are forming, and the baby's eyes are visible.Feet and hands can be distinguished and now have fingers and toes (digits), which may still be webbed.Fingers and toes begin to form, and arms and legs have grown longer.Electrical activity begins in the developing brain and nervous system.The embryo is about 1/ 2-inch and has a four-chambered heart and nostrils.(8 weeks after the first day of the last normal menstrual period) Rudimentary blood moves through the main vessels.The heart continues to develop and now beats at a regular rhythm.Tissue forms that develops into the vertebra and some other bones. The brain develops into five areas and some cranial nerves are visible.Structures that will become arms and legs, called limb buds, begin to appear.The embryo is about 1/ 6-inch long and has developed a head and a trunk.(6 weeks after the first day of the last normal menstrual period) The embryo is about 1/ 100 of an inch long at this time. Implantation begins the first week and the embryo continues to grow.(4 weeks after the first day of the last normal menstrual period) Fertilization normally occurs within several hours of ovulation (some authors report up to 24 hours) when a man's sperm combines with a woman's egg (2 weeks after the first day of the last normal menstrual period)īiologically speaking, fertilization (or conception) is the beginning of human development. Stages of Fetal Development - First Trimester
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