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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 July 25, 2014

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 How nerves tell top from bottom - front from back  Limb regeneration: Do salamanders hold the key?   Unexpected origin for parts of nervous system  Key protein in embryo stem cell differentiation found  Dad's drinking affects son's response to alcohol Gene 'dark matter' controls embryo lung growth   Birth spacing matters in avoiding preterm births  Ice Storm Project records maternal stress 'Pill for Males' still not ready  Red wine causes pancreatic abnormalities in fetus  Wobble identifies amino acids in gene coding   A single DNA tweak leads to blond hair Found: Essential circadian clock protein  First steps to stem cells becomming 3 fetal cell layers   How brain neurons sense chemical cue to cross-over   Why girl babies win in the battle for survival   Sacrificing immature eggs for the greater good   How stem cells develop may help us fight obesity  Rhythmic electric pulses teach brain to hear  New sperm poised to become any cell 

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