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Pregnancy Timeline by SemestersFetal liver is producing blood cellsHead may position into pelvisBrain convolutions beginFull TermWhite fat begins to be madeWhite fat begins to be madeHead may position into pelvisImmune system beginningImmune system beginningPeriod of rapid brain growthBrain convolutions beginLungs begin to produce surfactantSensory brain waves begin to activateSensory brain waves begin to activateInner Ear Bones HardenBone marrow starts making blood cellsBone marrow starts making blood cellsBrown fat surrounds lymphatic systemFetal sexual organs visibleFinger and toe prints appearFinger and toe prints appearHeartbeat can be detectedHeartbeat can be detectedBasic Brain Structure in PlaceThe Appearance of SomitesFirst Detectable Brain WavesA Four Chambered HeartBeginning Cerebral HemispheresFemale Reproductive SystemEnd of Embryonic PeriodEnd of Embryonic PeriodFirst Thin Layer of Skin AppearsThird TrimesterSecond TrimesterFirst TrimesterFertilizationDevelopmental Timeline
Roll over chart for details of fetal developmental progress
The timing of infant development is better illustrated in this chart which does not confine itself to the three trimester system.

True Developmental Timeline

News Alerts February 3, 2012

Male and Female Behavior Deconstructed Same DNA Test Detects Downs, Trisomy 18 and 13 Syndromes Brain Gene Regulator Tracked Across Human Lifespan Multiple Anesthesias May Elevate Rate of ADHD Prosopagnosia, Not Just Another Pretty Face Controlling Sugar Would Ease Public Health Burden Egg Donation Risks Similar in Older and Younger Moms PTEN Gene and Hearing Problems in Autism PFCs May Hinder Vaccination Effectiveness Higher Risk For Childhood Leukemia In Hispanics Sexual Healing? Not Likely! Ultrasound Male Contraception Works Discovery May Lead to Treatment for Rett Syndrome Mutations Tied to Aggressive Childhood Brain Tumors Body Clock Linked to Diabetes in New Genetic Study
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Visible Embryo True Developmental Timeline