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Welcome to The Visible Embryo, a comprehensive educational resource on human development from conception to birth.

The Visible Embryo provides visual references for changes in fetal development throughout pregnancy and can be navigated via fetal development or maternal changes.


  WHO International Clinical Trials Registry Platform (ICTRP)

The mission of the WHO International Clinical Trials Registry Platform is to ensure that a complete view of research is accessible to all those involved in health care decision making. This will improve research transparency and will ultimately strengthen the validity and value of the scientific evidence base.



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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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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 activateFetal liver is producing blood cellsBrain convolutions beginBrain convolutions beginImmune system beginningWhite fat begins to be madeHead may position into pelvisWhite fat begins to be madePeriod of rapid brain growthFull TermHead may position into pelvisImmune system beginningLungs begin to produce surfactant
CLICK ON weeks 0 - 40 and follow along every 2 weeks of fetal development




  Mar 30 2020Latest news in developmental biology Monday to Friday

Boosting Older People's Immune Response to Vaccines
Vaccines work by generating antibodies able to block pathogens that infect us. With age, the magnitude and quality of our germinal centre reaction declines...



Mar 27 2020Latest news in developmental biology Monday to Friday

Cell Cytoskeleton Is a Permanent Construction Site
A cell's cytoskeleton consists of protein filaments that are continually lengthening and shortening in a continuously dynamic process...


Mar 26 2020Latest news in developmental biology Monday to Friday

Pressure Induces Cells to Get Sticky
In the first two weeks of embryo development, 'force' changes cell surface tension essential in organ formation...


Mar 25 2020Latest news in developmental biology Monday to Friday

How Stem Cells Become Organs
Molecular signals dictate which organs embryonic stem cells will become in the first two weeks of embryo development...


Mar 24 2020Latest news in developmental biology Monday to Friday

New Coronavirus Testing Kits Under Development
Canadian researchers have developed a coronavirus test that can detect a positive RNA strand in the virus...


Mar 23 2020Latest news in developmental biology Monday to Friday

CCL2 Molecule Important To Autoimmune Defense
Medications used in adults and children with different forms of autoimmune inflammatory arthritis or lupus are now being examined in response to coronavirus infections...



Mar 20 2020Latest news in developmental biology Monday to Friday

Length of Pregnancy Alters a Child's DNA
With each additional week of pregnancy, DNA methylation changes thousands of genes...


Mar 19 2020Latest news in developmental biology Monday to Friday

COVID-19 Virus Epidemic Has Natural Origins
Analysis of public genome sequence data from SARS-CoV-2 and related viruses found no evidence that the virus was made in a laboratory or otherwise engineered...


Mar 18 2020Latest news in developmental biology Monday to Friday

Scientists Identify COVID-19 Vaccine Targets
Scientists identify a set of potential vaccine targets for SARS-CoV-2 coronavirus...


Mar 17 2020Latest news in developmental biology Monday to Friday

COVID-19 Not Transmitted Pregnant Mom to Newborn
Four babies born in a hospital in Wuhan, the epicenter of the novel coronavirus outbreak, did not show signs of infection and remain healthy today...


Mar 16 2020Latest news in developmental biology Monday to Friday

Repairing DNA Breaks in Aging, Cancer and MND
Experts discover a new 'toolkit' of proteins which can lead to repair of DNA breaks...



Mar 13 2020Latest news in developmental biology Monday to Friday

Discovering The Origin of Modern Proteins
By bringing the ancient history of two proteins back to life, researchers catch a glimpse of how a billion year old molecular partnership works...


Mar 12 2020Latest news in developmental biology Monday to Friday

Household Chemicals Linked to Child Language Delay
Young children in low income homes frequently likely to show delay in language development by age 2...


Mar 11 2020Latest news in developmental biology Monday to Friday

Improving High Blood Pressure Management
New 'real world' data reveals opportunities for blood pressure improvement...


Mar 10 2020Latest news in developmental biology Monday to Friday

Brain Waves Stimulate Muscle Movements
How waves in the motor cortex of our brain help initiate and regulate muscle movement...


Mar 9 2020Latest news in developmental biology Monday to Friday

Stress In Pregnancy Can Last a Lifetime
Mice exposed to stress in the womb and soon after birth can expect a lifetime of immune system deficiencies...



Mar 6 2020Latest news in developmental biology Monday to Friday

Existing Drugs Give Some Defence Against Coronavirus
Broad-spectrum antiviral agents could be a possible quick response to the potential COVID-19 pandemic...


Mar 5 2020Latest news in developmental biology Monday to Friday

Dozens of Mutations in Crucial Brain Gene
Numerous malfunctions in one brain growth gene now considered a developmental disability syndrome...


Mar 4 2020Latest news in developmental biology Monday to Friday

Molecule Offers Hope for Stoping Parkinson's
A promising molecule has offered hope for a new treatment that could stop or slow Parkinson's, something no treatment can currently do...


Mar 3 2020Latest news in developmental biology Monday to Friday

Treating Fetal Disorders With Stem Cell Transplants
Stem cells can migrate to fetal brain and body locations needing help to produce crucial missing protein...


Mar 2 2020Latest news in developmental biology Monday to Friday

What Regulates Early Placental Growth?
CRISPR technology reveals function of a very large gene found only in the placenta, stem cells and certain cancers...



Feb 28 2020Latest news in developmental biology Monday to Friday

Stem Cells Given to Fetus Treat Metabolic Disorders
Fetal stem cell/enzyme therapy may alleviate some congenital diseases that often result in pregnancy loss...


Feb 27 2020Latest news in developmental biology Monday to Friday

CRISPR Slows ALS Progression In Mice
New CRISPER editing technique changes one letter of DNA sequence without cutting through both DNA strands...


Feb 26 2020Latest news in developmental biology Monday to Friday

Closing In On Cell Originating Ovarian Cancer
New technique identifies six previously unknown cell types in human fallopian tubes...


Feb 25 2020Latest news in developmental biology Monday to Friday

How to Affect Organ Size and Shape
Morphogens identify cells by location and send those cells specific signals directing their growth...


Feb 24 2020Latest news in developmental biology Monday to Friday

Pregnancy High Blood Pressure Link to DNA Methylation
Gene adaptations correspond to blood pressure increases at distinct intervals during pregnancy...



Feb 21 2020Latest news in developmental biology Monday to Friday

Antidepressant Harms Baby Neurons in Lab 'Mini-Brains
Stem-cell model 'brains' could allow for rapid testing of drugs and chemicals for potential neurotoxicity...


Feb 20 2020Latest news in developmental biology Monday to Friday

Can Acid Reflux Drugs Curb Preterm Births?
Research identifies a dozen drugs that reduce inflammation, as slowing the onset of pre-term birth...


Feb 19 2020Latest news in developmental biology Monday to Friday

Closing In On Cell of Origin For Ovarian Cancer
New technique identifies previously unknown cell types in human fallopian tubes...


Feb 18 2020Latest news in developmental biology Monday to Friday

Tiny Hydractinia Produces Unlimited Eggs & Sperm
Research on Hydractinia might provide clues to human reproduction...


Feb 17 2020Latest news in developmental biology Monday to Friday

One in Three Plants & Animals to Disappear by 2070
University of Arizona researchers predict one third of plants and animal species will be extinct from climate changes by 2070...



Feb 14 2020Latest news in developmental biology Monday to Friday

EPA Fails to Follow Landmark Law Protecting Children
The EPA has failed to add mandated children's health safety to limits for almost 90% of most common pesticides...

Feb 13 2020Latest news in developmental biology Monday to Friday

Rogue Cell Communication Leads to Leukaemia
Deciphering how rogue communication between blood stem cells causes leukaemia...

Feb 12 2020Latest news in developmental biology Monday to Friday

How Do Some Mammals Pause Pregnancy?
A biochemical lag exists between conception and pregnancy in many mammals...

Feb 11 2020Latest news in developmental biology Monday to Friday

Predicting The Ideal Transplant Donor & Recipient
It may now be possible to predict the best candidate for receiving an organ transplant...

Feb 10 2020Latest news in developmental biology Monday to Friday

New Prenatal Blood Test May Identify Gene Errors
A new study assessing DNA from live cells is "proof of concept" for potential non-invasive genetic diagnosis...



Feb 7 2020Latest news in developmental biology Monday to Friday

Mom's Stress During Pregnancy Affects Fetal Brain
A mother's mental health alters the structure and biochemistry of her infant's developing brain...

Feb 6 2020Latest news in developmental biology Monday to Friday

Do You Get Easily Out of Breath?
Perhaps you were small at birth, a new study suggests...

Feb 5 2020Latest news in developmental biology Monday to Friday

Aging Cells Lead to Neurodegeneratve Diseases
Buck research discovers how cell aging leads to the degeneration of nerve cells, a finding significant to studies of both dementia and brain cancer...

Feb 4 2020Latest news in developmental biology Monday to Friday

Low-calorie Sweeteners Risky for Infants
New research shows the impact 'diet' ingredients have on body weight and gut microbiota...

Feb 3 2020Latest news in developmental biology Monday to Friday

Can Resetting Circadian Clocks Control Diabetes?
Research demonstrates a link between disturbance in circadian clocks in pancreatic cells - with type 2 diabetes, and can correct that disturbance...




Jan 31 2020Latest news in developmental biology Monday to Friday

Fat Cells Sense Sunlight
Lack of sunlight can lead to problems beyond seasonal affective disorder...

Jan 30 2020Latest news in developmental biology Monday to Friday

Possible Alzheimer's Breakthrough
A newly found protein 'aggregatin' is a bio-marker for Alzheimer's disease and may lead to treatments to slow its progression...

Jan 29 2020Latest news in developmental biology Monday to Friday

Surprise in How Eyes 'See'
Long before a baby opens its eyes for the first time, it's brain is ready to start decoding visual stimuli...

Jan 28 2020Latest news in developmental biology Monday to Friday

First Induced Autism Symptom Improvements
Bumetanide - a drug for edema - improves symptoms in young children with autism without significant side effects...

Jan 27 2020Latest news in developmental biology Monday to Friday

Children Under 5 at High Risk for Flu Complications
Full flu vaccination among children cuts hospitalization in half...




Jan 24 2020Latest news in developmental biology Monday to Friday

Linking ALS Genes To Enzyme - Gemin3
A new study holds promise for treating and perhaps slowing down ALS/Lou Gehrig's disease...

Jan 23 2020Latest news in developmental biology Monday to Friday

Zika Birth Abnormalities Linked to Mom's Malnutrition
The severity of Zika deformities in babies is shown to be affected by a mother"s own malnutrition...

Jan 22 2020Latest news in developmental biology Monday to Friday

Princeton Recreates A Key Step In Cell Division
Recreating key cell division step that defines a protein elevated in cancer...

Jan 21 2020Latest news in developmental biology Monday to Friday

Intestinal Organoids Developed to Model Disease
A new way to generate human cells for testing gastrointestinal diseases...

Jan 20 2020Latest news in developmental biology Monday to Friday

Fast Food Fry Oil Linked to Obesity & Diabetes
America's most widely consumed fry oil causes genetic changes in our brains as well...




Jan 17 2020Latest news in developmental biology Monday to Friday

Single Molecule May Explain Allergic Contact Dermatitis
New insight as to what may trigger immune responses to skin creams and commercial products...

Jan 16 2020Latest news in developmental biology Monday to Friday

One Infection Can Induce Irritable Bowel Syndrome
Intestinal infection is just the beginning for IBS...

Jan 15 2020Latest news in developmental biology Monday to Friday

Chromatin Folds Into The Cell Nucleus Like A 3D Forest
Chromatin helps pack about six feet of DNA into each cell nucleus in our body...

Jan 14 2020Latest news in developmental biology Monday to Friday

Condensing DNA to Fit Into Sperm Can Lead to Errors
Researchers track defective DNA errors in sperm and potentially find ways to correct defects...

Jan 13 2020Latest news in developmental biology Monday to Friday

Puberty Gives Insights Into Normal Growth and Cancer
The first-ever genome-scale analysis of human male puberty shows testosterone impacts stem cells...




Jan 10 2020Latest news in developmental biology Monday to Friday

Having a Baby Can Cost $4,500 Out-of-Pocket
The most expensive part of having a baby is birth itself...

Jan 9 2020Latest news in developmental biology Monday to Friday

Organic Pollutants in Mom's Blood Link to Small Fetus
Pregnant women exposed to persistent organic pollutants, or POPs, have slightly smaller fetuses than women not exposed to these chemicals...

Jan 8 2020Latest news in developmental biology Monday to Friday

A Man's Diet Quickly Effects His Sperm Quality
Sperm are influenced by diet and the effects are rapid...

Jan 7 2020Latest news in developmental biology Monday to Friday

Identifying Every Brain Cell
Neuroscientists want to classify each of the brain's many cells...

Jan 6 2020Latest news in developmental biology Monday to Friday

Deciphering Life's Equations
A new theory describes what all animals have in common, allowing for predictions about organisms by scientists...




Jan 3 2020Latest news in developmental biology Monday to Friday

Common Antidepressant Affects Baby
Early exposure to a common antidepressant (SSRI) during pregnancy changes sensory processing in neonatal mouse brain...

Jan 2 2020Latest news in developmental biology Monday to Friday

Sight Doesn't Work The Way We Thought
Specific neurons were thought to capture images in defined brain areas...

Jan 1 2020Latest news in developmental biology Monday to Friday

Mouse Eggs Can Come From Granulosa Cells
Mouse pups were recently born from eggs made from granulosa cells - which typically only surround an egg...

Dec 31 2019Latest news in developmental biology Monday to Friday

Target For Restoring Spinal Cord Injury
Indiana Universary identifies potential target for restoring movement after spinal cord injury...

Dec 30 2019Latest news in developmental biology Monday to Friday

Embedding A Special Molecular Switch Into A Gene
A special molecular switch may be able to be embedded into genes allowing doctors to control gene dosing...