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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


News Alerts Nov 27, 2014   Mom's presence changes genes in infant brain A gene mutation that alters the male fetus  Molecular signal turns on stem cells in brain Finding "lost" languages in the brain  A potential way to restore hearing  Making cells self-renewing  The science behind Total Memory Recall  How the male brain is molded  Resetting a woman's biological clock  How cells know which way to go Human stomach created from pluripotent stem cells Clues to heart defects in Down Syndrome   Sugars help us differentiate seasons   Prematurity may explain some neurological risks Constructing embryos from stem cells   Spontaneous genetic errors found to cause autism  Cash register receipts are high in Bisphenol A (BPA)  Fetal BPA exposure increases adult food allergies  Baby cries reveal cocaine exposure in pregnancy Infants pick up social cues from your eyes  Down syndrome develops into Alzheimer's A kid’s genes and moms’ risk for rheumatoid arthritis 'Paradigm shift' explains potassium channels Recipe to make bone and cartilage Mitochondrial errors in children of older moms Neurons “fine tune” themselves at gene level Broccoli sprouts show promise in treating autism PCBs can change thyroid hormone during pregnancy Rett syndrome mice improve with diet Teens exposed to THC may 'waste' immune systems Cancer drug eases mental illness in mice How a gene change causes childhood eye tumors Virus in Utero May Trigger Childhood Diabetes Contaminated water and pregnancy complications  How tissue grows  Bad signal to Sonic Hedgehog creates child brain tumors Gene error affects immunity and facial development How to place a chemical tag to control a gene Discovered, an On/Off switch for aging Don’t drink from (warm) plastic bottles!  Improving language before a baby can speak Ear 'hair' cells need precise alignment to work  Green neighborhoods mean better birth weights Breast versus bottle feeding  Breast milk protects infant from intestinal disorder   First international standards for infants/newborns  Phthalates heighten risk for childhood asthma  Vitamin E critical during first 1,000 days of life  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

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