Carnegie Stages - 1st Trimester Pregnancy2nd Trimester Pregnancy3rd Trimester PregnancyCarnegie Stage 1 - Fertilization Carnegie Stage 2 - CleavageCarnegie Stage 3 - Early BlastocystCarnegie Stage 4 - ImplantationCarnegie Stage 5 - Implantation CompletedCarnegie Stage 6 - GastrulationCarnegie Stage 7 - NeurulationCarnegie Stage 8 - Primitive PitCarnegie Stage 9 - First SomitesCarnegie Stage 10 - Neural Folds, Heart TubeCarnegie Stage 11 - Optic VesicleCarnegie Stage 12 - Upper Limb BudsCarnegie Stage 13 - First Layer Skin Carnegie Stage 14 - Esophagus FormingCarnegie Stage 15 - Cerebral Hemispheres FormingCarnegie Stage 16 - Hindbrain DevelopingCarnegie Stage 17 - Primitive germ cellsCarnegie Stage 19 - Semicircular Canals Forming in Inner EarCarnegie Stage 20 - Spontaneous MovementCarnegie Stage 21 - Intestines MigrateCarnegie Stage 22 - Brain can move musclesCarnegie Stage 23 - End of embryonic developmentWeeks 10 to 11 - Basic Brain Structure CompleteWeeks 12 to 13 - Fetus begins to move aroundWeeks 14 to 15 - Sexual organs now clearly visibleWeeks 16 to 17 - Fingerprints and toe prints beginWeeks 18 to 19 - Brown fat surrounds the lymphatic system.Weeks 20 to 21 - Bone marrow starts making blood cellsWeeks 22 to 23 - Inner ear bones harden, hearing possibleWeeks 24 to 25 - Sensory brain waves begin to activateWeeks 26 to 27 - Lungs begin to produce sufacantWeeks 28 to 29 - Brain Surface Convolutions BeginWeeks 39 to 40 - Baby full termWeeks 41 - 41 Baby full termWeeks 38 to 39 - Fetal liver is producing blood cellsWeeks 36 to 37 - Body is round and plump with white fatWeeks 34 to 35 - Gastrointestinal system still very immatureWeeks 32 to 33 - Fetus begins to develop immune systemWeeks 30 to 31 - Rapid brain growth; head size increasesPregnancy - 1st TrimesterPregnancy - 1st Trimester



The Visible Embryo is a visual guide through fetal development from fertilization through pregnancy to birth. As the most profound physiologic changes occur in the "first trimester" of pregnancy, these Carnegie stages are given prominence on the birth spiral.

The shape and location of embryonic internal structures and how they relate and are connected to each other is essential to understanding human development. Medical professionals create a mental picture of this process in order to determine how well the fetus is progressing. It is also the basis of knowing how and when errors in development occur and if a possibility exists for a corrective intervention.

It is equally important for expectant parents to understand the relationship of these internal structures and how their infant develops through pregnancy.

Creating the images for The Visible Embryo, included capturing data from slides and three dimensional structures on fetal anatomy in The National Institutes of Health, Carnegie Collection of embryos, as well as from 3D and 4D ultra sound images.


Disclaimer: The Visible Embryo web site is provided for your general information only. The information contained on this site should not be treated as a substitute for medical, legal or other professional advice. Neither is The Visible Embryo responsible or liable for the contents of any websites of third parties which are listed on this site.

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News Alerts Nov 26, 2014  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 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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