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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 Aug 22, 2014

Embryonic cell fate sealed by the speed of a signal  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  Two proteins 'pulse' information into memory  Gene link to fatal child inflammatory disease SAVI   Life-saving stem cells may be easier to create Sexual selection linked to placenta formation "You are what your grandfather ate"  One injection stops diabetes in its tracks   Gene essential in embryos, toxic in adult cell division   Timing is not only ticking  An amazing'switch' in our brains Reverse engineering brain circuits  Babies of healthy moms worldwide are similar Dad's ethnic origin influences child's birthweight   Schizophrenia gene affects brain cell development   Embryonic stem cells organize geometrically   Child life stress can leave lasting impact on brain  3-D view of brain's center of memory and learning   How sperm bore into the egg  "Enhancer" gene region triggers cell pluripotency   Caffeine affects boys and girls differently in puberty   Scoliosis and Marfans linked to rare gene mutations

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