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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 May 17, 2012

Multiple Channels Help Brain Avoid Traffic Jams Positive Feedback in the Developing Brain Measuring Synapse Between Neurons, Muscle Cells Losing Weight Is Hard, Keeping It Off Harder Sugar Makes You Stupid New Importance of Human Breast Milk Same DNA Replication Protein Active in Mitosis, Cancer Discovery Of Mutation Causing Rare Syndrome How To Trap MicroRNA Neurotransmitters Also Lead to Forgetting Stem Cell Differentiation Requires DNA Compaction Insect Glands Help Illuminate Human Fertilization
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Visible Embryo True Developmental Timeline