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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 May 14, 2013

 Retinoblastoma 1 gene fights cancer when starved  Mutation causes one type of Blue-Baby Syndrome  Baby formula use helps some mothers breastfeed longer  PiWi proteins defend sex cells from 'jumping genes'  Women altering menstruation cycles in large numbers  Brain progenitor cells transform to protect injured nerves  Brain anatomy of dyslexia not the same in men, women, boys or girls   Early infant growth rate linked to gut microbiota Dad's genome ready at fertilization, mom's need to catch up Gene mutation causes Sturge-Weber syndrome—port-wine birthmarks  2 Genes combine to cause cerebellar ataxia and reproductive failure  One big European family! Placental blood flow influences malaria during pregnancy  Understanding the starlet sea anemone helps us understand ourselves  Hit by two hammers: Deficiencies in two genes halt formation of gut nervous system  FDA warns pregnant women to not use certain migraine prevention medicines  Divide and define: How stem cells produce different kinds of cells  'Bioelectric' Arteries Open Path to Heart Disease Treatment  Saliva Can Clean Dirty Pacifiers and Reduce Allergy Risk  New mechanism discovered in meiosis  New brain research shows two parents may be better than one  Turning human stem cells into brain cells  New mechanism discovered in meiosis  New brain research shows two parents may be better than one  Turning human stem cells into brain cells

 


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