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Pregnancy Timeline by SemestersDevelopmental TimelineFertilizationFirst TrimesterSecond TrimesterThird TrimesterFirst Thin Layer of Skin AppearsEnd of Embryonic PeriodEnd of Embryonic PeriodFemale Reproductive SystemBeginning Cerebral HemispheresA Four Chambered HeartFirst Detectable Brain WavesThe Appearance of SomitesBasic Brain Structure in PlaceHeartbeat can be detectedHeartbeat can be detectedFinger and toe prints appearFinger and toe prints appearFetal sexual organs visibleBrown fat surrounds lymphatic systemBone marrow starts making blood cellsBone marrow starts making blood cellsInner Ear Bones HardenSensory brain waves begin to activateSensory brain waves begin to activateLungs begin to produce surfactantBrain convolutions beginPeriod of rapid brain growthImmune system beginningImmune system beginningHead may position into pelvisWhite fat begins to be madeWhite fat begins to be madeFull TermBrain convolutions beginHead may position into pelvisFetal liver is producing blood cells
Roll over chart for details of fetal developmental progress
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News Alerts April 18, 2014

 
Protein essential for fertilisation discovered Stem cell light-activated neurons restore muscle function  Breastfeeding and infant sleep  Prenatal lipid levels impact autism  Yale search for earliest roots of psychiatric disorders  Prenatal lipid levels impact autism  Dog cleft palate aids in our understanding of human palate defect  Pregnancy ends sooner during heat waves    Potential treatment for mitochondrial disorders Surface area of a cell determines when it divides Disorganized neocortex origin of autism?  Hox genes determine body form and firefly light  Fetal alcohol disorders under-recognized Stress impacts your ability to get pregnant  Rhythmic signals synchronize all change in a cell How to activate cell survival in children's disease Brain evolution gene linked to autism  UV exposure lowers folate in young women  Fast-moving immune cells march-in-step Why chromosome errors are high in eggs Child's preference for sweet or salty linked  Tension triggers muscle building  The USP9X gene is critical to brain development  Forgetting is regulated A common mutation drives leukemia relapse  A gel that repairs bone and may replace teeth  How a zebra gets its stripes Scientists link missing DNA to birth defects Potential target for treating allergic asthma Protein linked to learning, pain, brain disorders  3-D imaging reveals how Apert syndrome develops  Evolution at work  Link between Vitamin D, Serotonin and Autism  How low birth weight affects the adult Pinpointing area essential to social memory  Lack of prenatal vitamin A and asthma  Cell fate switch that decides liver - or pancreas?  One in three women not taking folic acid before pregnancy  Improving a genetic heart defect

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