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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 Sep 22, 2014

 
Prenatal alcohol linked to mental health problems   Mechanism may fuel Downs babies in older moms  Infant's diet creates unique immune systems  A molecular motor for human development  Key to making new muscles  Preemie apnea therapy has no long-term effects  No link between antidepressants and autism risk  Exercise before school reduces ADHD symptoms  "Healthier" brains in kids who exercise  Pregnant women NEED to get flu vaccine  Calcium and reproduction go together  Thymus organ grown from cells in a lab  Single change in DNA could initiate fragile X  Missing protein restored in muscular dystrophy How NSAIDs, like aspirin, affect tissue membranes  Anti-depressant targets child medulloblastoma  Children with autism have extra synapse junctions  Mental illness-linked genes reduce synapses Phthalates in plastics can block testosterone  microRNAs new basis for sex determination  Stress in pregnancy passed down for generations  Embryonic cell fate sealed by the speed of a signa Finding the 3-D structure of a neuroreceptor  Prenatal alcohol affects all brain development  How enzymes know what to keep or trash in a cell   Scientists find calorie-burning switch in brown fat   A neural 'sweet spot' may help curb obesity  Turing theory (1952) explains formation of fingers  Autism, Sensory Processing Disorders not the same   Sugar chains guide stem cells to a neural fate   Brain cells arrange themselves by birth order  Mom's DDT exposure linked to obesity and diabetes  Molecular competition specializes adult stem cells  Preterm children's brains can catch up years later   Mothers teach babies fears via mother's own odor  Age of female puberty depends on only one parent   Kisspeptin may trigger IVF ovulation more safely  Key to egg implantation in uterus  Found, crucial path to embryo facial development  Good mothering' hardwires infant brain 

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