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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 beginningWhite 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     Birth Spiral  Mouse teeth give insight into tissue regeneration  Birth Spiral  Can we now turn off allergy-sensitive cells?  Birth Spiral  Fertility can hinge on sperm swimming conditions  Birth Spiral  Neurons live long life in the gut of adult mice  Birth Spiral  Which facial features are most controlled by genetics?  Birth Spiral  Do you speak 'Terpene'?  Birth Spiral  Secrets of menstrual cycle and early pregnancy  Birth Spiral  Sensory cells give hope to restoring hearing  Birth Spiral  'Lab on a chip' may reduce preterm births  Birth Spiral  Game helps us understand animal camouflage  Birth Spiral  Fighting malaria with math  Birth Spiral  Multitasking secrets of RNA-binding  Birth Spiral  Progesterone and bisexuality: Is there a link?  Birth Spiral  Low birth weight babies near coal-fired power plant  Birth Spiral  Bad diet in pregnancy 'programs' bad health later  Birth Spiral  Stem cells from pee?  Birth Spiral  Mouse dad's diet affects his pups' mental health  Birth Spiral  Earliest embryonic stem cells identified  Birth Spiral  Why female fertility declines with age  Birth Spiral  Older mothers are better mothers    Apr 2017   Birth Spiral  How to calculate an immune response  Birth Spiral  Stop eating! You are full!  Birth Spiral  Sperm tails are "motorized" and need all their parts  Birth Spiral  A link science didn't catch  Birth Spiral  A giant leap forward to pill for anti-aging  Birth Spiral  A 'three-hit' theory of autism  Birth Spiral Defect in non-coding DNA can impair language  Birth Spiral Gene mutation may explain female infertility  Birth Spiral Potential clinical test and treatment for preterm birth  Birth Spiral Male infertility may be due to failure of calcium signal  Birth Spiral Can we stop neurons signaling their own death? Birth Spiral GABA may be key to regenerating human retinas Birth Spiral Will mammals ever be able to regenerate tissues? Birth Spiral What is a "brain organoid" and why do we need it? Birth Spiral A mouse 'embryo' made from stem cells  Birth Spiral Why staph, a common bacteria, induces severe illness  Birth Spiral A gene that makes the sexes look different Birth Spiral Cell fusion proteins link sex and viruses Birth Spiral Can math predict our growth and diseases? Birth Spiral A gene that reinforces maternal attachment? Birth Spiral 50+ year old protein paradox solved Birth Spiral Daylight savings can increase IVF miscarriages Birth Spiral Listeria may be a serious miscarriage threat  Mar 2017   Birth Spiral Neurons can choose to activate mom or dad's genes Birth Spiral Can damage of dementia and Alzheimer's be undone? Birth Spiral Unexpected influence on how stem cells divide  Birth Spiral How to normalise synapses in autism & schizophrenia  Birth Spiral Autism biomarkers found in infants  Birth Spiral Gene 'switch' clues us to origins of fine motor skills  Birth Spiral Why are you left or right handed? Birth Spiral Can cancer meds treat a group of genetic disorders? Birth Spiral The amazing uterus Birth Spiral 'Goldilocks' rules may govern genes in our evolution Birth Spiral Everyday chemicals threaten pregnant women Birth Spiral Contraceptive for male monkeys. Humans next? Birth Spiral 83 New genes for height found Birth Spiral Autism may begin at earliest brain development Birth Spiral Preemies don't use 'top-down sensory prediction' Birth Spiral Stronger muscles for newborn bies Birth Spiral Protein in womb plays lifelong role in bone health Birth Spiral Breathing molecule discovered Birth Spiral Ovo protein same across species  Birth Spiral Chromosome Traffic Cop   Feb 2017  Birth Spiral The Meiosis Tango Birth Spiral Scientists create human/pig chimera Birth Spiral Statins critical in formation of embryo Birth Spiral Genetic engineering tinkers with genes Birth Spiral In proteins, shape matters Birth Spiral Can we rescue injured brains? Birth Spiral Hunger switches on predatory brain instincts Birth Spiral New mouse model joins the fight against Zika Birth Spiral Why older mothers likely face birth complications Birth Spiral Salmonella directs brain tumors to self destruct Birth Spiral Key molecular enzyme locates sites of DNA breaks Birth Spiral Epstein-Barr virus related to Hodgkin's lymphoma Birth Spiral New hope for Prader-Willi syndrome Birth Spiral Early trial results shrink pediatric neural tumors  Birth Spiral Single target for pre-malignant bone marrow cancers? Birth Spiral Missing protein may explain Sudden Infant Death Birth Spiral Brain's facial recognition area grows in adulthood Birth Spiral RNA pathway plays key role in our lifespan Birth Spiral The role of mTORC1 in TSC and epilepsy Birth Spiral Low-carb diet relieves a form of intellectual disability Birth Spiral Brain white matter predicts cognitive functions by age 1 and 2  Birth Spiral How to Turn White Fat Brown   Jan 2017  Birth Spiral nSR100 protein's influence on autism Birth Spiral The Molecular basis for hydrocephalus Birth Spiral Controlling gene activity in human development Birth Spiral The Goldilocks effect in aging Birth Spiral Figuring out how one X-chromosome is silenced Birth Spiral Gesturing can boost children's creative thinking Birth Spiral New finding reveals battle behind our genes Birth Spiral We may not have lifelong immunity to toxoplasmosis Birth Spiral Kangaroo mothering helps preemies 20 years later Birth Spiral Secret to smart shopping: The right parenting style Birth Spiral Left hand does know what the right hand is doing Birth Spiral What makes a neuron a neuron? Birth Spiral Designing switches to control cell fate Birth Spiral Neural stem cells transport proteins just like RNA Birth Spiral Turning off Asthma Attacks  Birth Spiral China's one-child policy, likely overblown, now gone Birth Spiral Links between epilepsy drugs and birth defects Birth Spiral Low vitamin D in newborns increases risk MS later  Birth Spiral Toddlers can tell when others hold 'false beliefs'  Birth Spiral Protein that allows our brain and muscles to talk  Birth Spiral Tracking development of individual blood stem cells  Birth Spiral Having last baby after 35? Mental sharpness increases  Dec 2016Birth Spiral Mouse embryos put in suspended animation for weeks  Birth Spiral Tissue damage key to cell reprogramming  Birth Spiral 'Princess Leia' brainwaves help store memories  Birth Spiral Measuring the gaze between mom and her autistic baby  Birth Spiral Lying face up pregnant could increase risk of stillbirth  Birth Spiral Mom Rheumatoid Arthritis links to epilepsy in child  Birth Spiral A protein that points cells in the right direction  Birth Spiral First 3-D mathematical model of labor contractions  Birth Spiral Genes for speech may not be limited to humans  Birth Spiral Insulin resistance reversed by removal of Gal3 protein  Birth Spiral B12 deficiency can increase risk for type 2 diabetes  Birth Spiral Non-invasive prenatal test at five weeks of pregnancy?  Birth Spiral Heart disease, leukemia links to dysfunctional nucleus  Birth Spiral Blood vessels control brain growth  Birth Spiral Antibody protects developing fetus from Zika virus  Birth Spiral Better treatments possible for child brain cancer  Birth Spiral Autism linked to mutations in mitochondrial DNA  Birth Spiral Mother's blood test may predict birth complications  Birth Spiral Essential mouse genes give insight into human disease Birth Spiral Newborns given dextrose gel avoid hypoglycaemia Birth Spiral Mitochondria divide differently than once thought  Nov 2016 Birth Spiral Customizing vitamin D may benefit pregnant women Birth Spiral Antibody breaks leukemia's hold Birth Spiral Strong, steady forces needed for cell division Birth Spiral "Fixing" energy signals to treat mitochondrial disease Birth Spiral How eggs get the wrong number of chromosomes Birth Spiral Fatal preemie disease due to mitochondrial failure Birth Spiral Zika virus spreads during brain growth spurts Birth Spiral Short jump from single-cell to multi-cell animals   Birth Spiral Brainstem and visual cortex control our eyes Birth Spiral Embryos make sex cells in their first two weeks Birth Spiral Mom's BMI may affect biological age of her baby Birth Spiral Two distinct cell types can initiate Crohn's disease Birth Spiral Potential treatment of newborns via amniotic fluid? Birth Spiral Infants use their prefrontal cortex to learn Birth Spiral 'Amplifier' helps make connections in the fetal brain Birth Spiral Neurons migrate throughout infancy Birth Spiral Calcium triggers stem cells to generate bone Birth Spiral How evolution has given us 5 fingers Birth Spiral New links between genes and bigger brains Birth Spiral New links between genes and bigger brains Birth Spiral Progesterone in contraceptives promotes flu healing Birth Spiral ZIKA in Men? "No procreation for 6 months" Birth Spiral Genetically modified baby boy - with 3 parents Oct 2016 Birth Spiral Genetic variations that cause skull-fusion disorders Birth Spiral Heart defect genes both inside and outside the heart Birth Spiral Cesarean baby 15% more likely to become obese Birth Spiral Male primes female for reproduction - but at a cost Birth Spiral Why Tardigrades Are So Indestructible Birth Spiral Mouse bone marrow cells reduce miscarriage? Birth Spiral How maternal genes give control to embryonic genes Birth Spiral Stem cells may halt Multiple Sclerosis symptoms Birth Spiral Stem cells may halt Multiple Sclerosis symptoms Birth Spiral Gene linked to infertility in male mice Birth Spiral High food availability slows down cell aging Birth Spiral Zika brain injury therapy must start at time of bite Birth Spiral How GBS bacteria can cause preterm birth Birth Spiral Scientists make embryos from non-egg cells Birth Spiral Placenta pivotal in influencing pregnancy outcome Birth Spiral How does a cell initiate DNA repair Birth Spiral lncRNA structure affects its function Birth Spiral Cell fate a result of genetic tugs of war Birth SpiralUnlocking first steps in organ and tissue development Birth Spiral Stem cells differ in mice, monkeys, and humans Birth Spiral Chemicals from fracking may harm fertility Birth Spiral Checkmating the "Red King Theory" Birth Spiral  Morrbid gene fights infection havoc   Sep 2016 Birth Spiral A protein that promotes the breakdown of fat Birth Spiral Immune cells active in brain development  Birth Spiral Face shape is in our genes Birth Spiral Two proteins preserve vital genetic information Birth Spiral A molecular alarm clock wakes resting eggs Birth Spiral Risk factors for preterm birth can be changed Birth Spiral Zika infection may affect adult brain cells Birth Spiral How fish fins became fingers Birth Spiral Plastic BPS chemical harms human egg cells Birth Spiral Customizing breast milk for premature children Birth Spiral Mom in Single Family NICU room is best for preemies Birth Spiral Jaw-dropping research explains how mouth forms Birth Spiral A vaccine for strep throat and rheumatic fever? Birth Spiral Is there a 'mother's curse' ? Birth Spiral Non-Zika microcephaly helps explain brain growth Birth Spiral Tall or short, thick or thin what affects limb size? Birth Spiral Signals that trigger labor and delivery Birth Spiral Breakthrough in how stem cells become specialized Birth Spiral The force is strong — with embryo cells Birth Spiral Common diabetes drug may help prevent preterm birth Birth Spiral Origin of the female orgasm Birth Spiral Breastfeeding builds better brains Birth Spiral Embryonic gene, Nanog, can reverse cell aging Aug 2016 Birth Spiral Makeup therapy in a down economy Birth Spiral Cinnamon may be a fragrant medicine for the brain Birth Spiral A molecule for making friends  Pyramid cells cluster, vibrate and signal our brain  How environmental stresses cause birth defects  Virus found in women with unexplained infertility Pregnant nicotine exposure higher than reported Cells send out stop/go signals to extend nerves Anatomy of a decision Sound waves to separate twin placentas?  Selfish mitochondria implicated in diseases  Powering up: growing neurons make an energy jump  Virus in pregnancy linked to austim disorders Bipolar disorder link to striatum brain region Epigenetics could explain puzzle of diabetes inheritance   Many common chemicals endanger brain development   Children's immune cells may explain all their illnesses "Feeling good" stimulates immune system How the Pentagone protein controls development   Why does mitochondria DNA only come from mom?  Finding human development's first gear  July 2016    Study shows Zika infection longer in pregnancy  Daughters of obese mouse dads risk breast cancer CDC clinical trial for experimental Zika vaccine Saint Louis University to launch Zika vaccine trial  Loss of essential protein linked to hydrocephalus Low thyroid in pregnancy risks schizophrenia in baby Teen poor attention control risk for anxiety disorders Pregnant diet can affect multiple generations New insights uncovered in Prader-Willi syndrome Breastmilk best for premature baby's heart Gene mutation found explaining multiple sclerosis Individuals respond differently to Zika?  Moving can be hazardous to your child's health How melanin gives color to skin, hair and eyes Babies really are cute! Your biological clock has a time stamp   Maternal effects of smoking continue long after birth  A brain clock keeps our memories ticking  Gene sequencing diagnoses rare newborn diseases The developmental origins of culture How the brain makes — and breaks — a habit Jun 2016 Money really does matter in relationships   Executive power — developes from the nursery  Can lifespan be extended by point of view?  Mitochondrial DNA therapy still imperfect  Eating fruit prenatally boosts babies' cognition  BPA in pregnancy can put baby on course to obesity  Genes for nose shape identified  Neurons must wriggle to reach their final destination  Atlas of Human Malformation Syndromes being created  Fathers' age and lifestyle linked to birth defects A safe way to deliver drugs to the placenta  Zika causes neural stem cells to self-destruct  Scientists map brain to decode inner thoughts  You are what you eat!  Twin study finds gut microbiomes run in families  Another reason to breastfeed Breast milk fed preemies show larger brain growth An aggregate of protein in nerve cells can cause ALS  How did human limbs evolve?  Asynchronous waves key to embryo development  A cell's 'fuel gauge' promotes healthy development  Safe, inexpensive chemical reverses progeria  Confused cell signals lead to genetic disorders May 2016| Experimental drug cancels affect of Fragile X gene  Preschool nurturing boosts child's brain growth  Too much 'noise' can affect brain development  Human patterns follow the same cues as bacteria  The unique biology of human breast milk  Clues to how cells repair broken DNA First protein crystal structure corrects wrong theory  Deletions on chromosome 22, one cause of autism? Microvesicles for brain radiation recovery?  New type of cell death may help neurons regenerate  Single-cell embryos can be chimeras  Trophoblast cells unlikely entry point for Zika  Gene found for cleft palate  An overfed fetus can become an overweight teen  Three generations affected by one DDT exposure  How early female human embryos control X  Abnormalities in early embryos may self correct  How to prevent asthma in your newborn?    Protein on neural stem cell is hijacked by Zika virus  Fragile X in mice responds to experimental drug  Born to run? Apr 2016   Unraveling stem cells  Rewrite the text books! Fetal or placental cells? Precision medicine targets Lupus Cell 'rejuvenation' relies on telomeres PKU effect on brain more extensive than thought  A possible treatment for autism-like symptoms Complex learning dismantles barriers in the brain Can we turn off Alzheimer's disease?  A new kind of stem cell? Genes can cause neurological diseases  Brown fat in adults follows circadian rhythm  Mom's bacterial infection can change fetal brain  Zika virus breakthrough  Lack of stem cells causes recurring miscarriages  A first: earliest stages of human stem cell lines  One microRNA may affect many neuro disorders  Common gene links obesity to diabetes Perception of constant stress is passed on...   Snail shells help solve origins of body symmetry  Trimmer snips jumping genes  Mom's high alcohol level disrupts neonatal brain  Amino acids help kids overcome fetal malnutrition  Mar 2016   Zika virus linked to stillbirth, loss of brain tissue  How to regenerate peripheral nerves  How the nervous system trims its branches   Teaching stem cells to build muscle  'Pump' mechanism splits DNA for copying by RNA Stressed dads give offspring high blood sugar Cell division errors: infertility, disorders and cancers Copper key to brain cell development Bioelectric signals influence facial symmetry   Potential to treat hypertrophic cardiomyopathy   Fluorescent proteins light up living cells Tuning the volume on gene expression  Linking fetal to adult brain disorders  A quick, simple way to generate neural crest cells  New drug target for Rett syndrome  RNA quick — Protein slow   Mitochondria trigger cell aging  How to precisely regulate RNA polymerase? New app helps doctors predict preterm birth   Found - protein that turns off biological clock   Virus in pregnancy causes autism-like behavior Feb 2016    A gene that allows for a new species?  3 Autism-linked molecules wire up neurons   Donor's genome impacts iPS cell outcomes  What you eat can influence how you sleep  Brain receptor regulates fat burning in cells Diverse gut microbes increase infection resistance  Zika virus, linked to birth defects, is spreading   Eat fish in pregnancy to improve baby's brain   Turning epigenetic marks OFF!  Cell signal strength turns on early stem cells   Slow stem cell division causes small brain?   Healing muscular dystrophy with CRISPR   Of protein kinases, embryos and cancer  Can having more children slow down aging? Uterine microorganisms may set stage for disease   A mathematical model for animal stripes   Physics attempts to explain why stem cells move  Epigenetic change leads to cerebellum circuitry   Id tags define developing neural circuits   Mechanism for how organs branch found   How to multiply teeth!   Jan 2016