First month (4 weeks) after birth is the neonatal period of development. Therefore, an extra 2 weeks is counted at the beginning of your pregnancy when you are not actually pregnant. At the end of the 8th week, the fetus has distinct human features and all major systems have begun to develop. Week 9 to week 37 (GA 11-39) or birth are considered the fetal period of development. This means your period is counted as part of your pregnancy even though you weren't pregnant at the time. The fetal period is a time of growth of the developing baby. By about 14 weeks of pregnancy, the gender of the fetus can be identified. A normal pregnancy lasts about 40 weeks from the first day of your last menstrual period (LMP). Weeks 9 thru 13 Gestational Age (Fetal Development Weeks 7 thru 11) At 10 weeks, the embryo is at the end of the embryonic period and begins the fetal period. At the end of the fetal period. Conception typically occurs about two weeks after your last period begins. To calculate your estimated due date, your health care provider will count ahead 40 weeks from the start of your last period. Fetal Age 24 weeks Sexual differentiation does not begin until the fetal period, during weeks 912. The fetal period. Weeks 9 what stages is the prenatal period made up of-pre-embryonic-embryonic-fetal. All of the tissues and organs that develop during the embryonic period grow and differentiate during the fetal period (week 9 of development until birth). Distal end 2d year 16th to 19th year Tubercle (occas.) Forty weeks into your pregnancy, or 38 weeks after conception, your baby might have a crown-to-rump length of around 14 inches (360 millimeters) and weigh 7 1/2 pounds (3,400 grams). Each developmental feature is linked to online content with more detailed information and resources such as images and movies. Weeks 4-8. Brain development during the fetal period involves neuron production, migration, and differentiation. 13th year Fuses with epiphysis of the proximal end and then with this to the diaphysis Fibula: Diaphysis 55th day (Mall). From the early fetal period until midgestation, most of the 85 billion neurons have been generated and many have already migrated to their brain positions. Pregnancy is assumed to start 2 weeks after the first day of the LMP. By the end of the 40th week of pregnancy 38 weeks after conception your baby is considered full term. The canalicular period of lung development is ending. At the end of the embryonic period. The fetus has grown to about 3 inches in length and weighs about an ounce. Disturbances during this point in development have the potential to disrupt major organ systems. week 9-birth. Survival without major morbidity* among infants surviving to discharge would be expected to be ~ 25% [21] Gestational Age 26 weeks (6 months) . The second trimester begins in the 13th week. 5th month of pregancy; but they start at the end of the 1st trimester. corpus luteum? The organs and structures formed in the embryonic period continue to grow and develop. The genitalia has clearly formed into male or female, but still can not be seen clearly on an ultrasound. Epiphyses: Distal end 2d year 20th to 22d year Proximal end 3d to 5th year 22d to 24th year Calcaneus: Chief centre 6th fetal month The chief nucleus is endochondral. what happens in the fetal period-continued differentiation and growth of tissues and organs-increase in crown-rump length-increase in weight. middle of the second semester. This period is extremely critical for your baby. This period is initially characterized by an increase in fetal size and, from the sixth month onwards, an increase in fetal weight. Respiration is possible towards the end of this period [17,19] Survival out of the womb at this age would be expected to be ~81%. when does the fetal period start and end. Embryonic males and females, though genetically distinguishable, are morphologically identical ().Bipotential gonads, or gonads that can develop into male or female sexual organs, are connected to a central cavity called the cloaca via Mllerian ducts and Wolffian ducts. Mesoderm lateral to the notochord : is derived from the hypoblast differentiates into ganglia migrates cranial to prochordal plate Sexual Differentiation.