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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 June 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  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  Money really does matter in relationships May 2016 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 Apr 2016 Confused cell signals lead to genetic disorders   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?  Mar 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   Feb 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 Jan 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!  Dec 2015    Increasing IVF cycles increases chances for live birth   Make impulsive choices? Blame mom and dad's genes   Multilingual babies use more cognitive control  How genes link heart and neurodevelop- mental disease   Messenger RNA may fine tune protein production   A major step toward growing kidneys  Sperm pass on information about dad's weight   Sperm 'see' it hot   Human stem cells likely safe for use in regenerative medicine   Turning point in a lifetime   Antidepressants increase autism risk 87 percent   A subtle dance of atoms influences enzymes   Molecule stops brain stem cells from becoming tumors   Sleep may strengthen our immune system   Neuroscientists now can read the mind of a fly   CBD in cannabis shows promise for severe epilepsy   Four studies explore memory decline with epilepsy   'App' may improve daily function in schizophrenia   Hippocampus essential in all aspects of recognition memory   Working memory is more complex than we thought  The silence of the genes  Cells 'reach out' to build trachea   How cells in the developing ear 'practice' hearing  Nov 2015   Correcting gene error restores brain function  Babies have logical reasoning before age one   How cells begin to shape a living being   Target gene identified to combat muscular dystrophy   Turning taste on and off in the brain   A master switch for brain development?   Targeting Alzheimer's disease through anti-aging   Repairing neurons with light    Our brain, more than chimp's, influenced by epigenetics   Do metabolites regulate embryo development?   Working on toddler's memory can help in high school   Batten disease may benefit from gene therapy   Prenatal blood test increases accuracy - reduces risk   A way to target Neuroblastoma   What happens if DNA cannot fit into the nucleus?   Why some genes are frequently read more than others   High stress in pregnancy may decrease baby's survival   More precise due dates for average pregnancy?   Can amniotic fluid predict time of delivery?   Singing calms baby longer than talking  Common preservative may increase breast cancer  Oct 2015 Antibiotics in children promote weight gain   Mom's preeclampsia increases risk to baby's heart   The mighty Panoramix — defender of genomes!   Splitting embryo to force twins for IVF - not advised   Dad's microRNA affects his baby's brain   How RNA regulates sex-linked disorders   Htt protein controls Rab direction on neurons   Regrow a tooth? Fish, yes! Humans, maybe ...   Sleep as reward boosts learning    Extra male brain cells remember sex more than food   Generating placental cells from skin cells   The father effect    Chromosome errors may explain brain birth defects   Gene links chromosome errors to early pregnancy loss   A gene that prevents Parkinson's disease and dementia   Ovarian transplants appear to be safe and effective   Restoring vision using pluripotent stem cells    Artificial Intelligence helps predict cancer    OB-GYN group urges prevention of chemical exposures   Global warming lowers birth weights   Kids being kids — make better parents   A hormone to break the obesity cycle?   Sep 2015   Pass the salt — How pregnancy drives food cravings   Mom's protein deficiency affects boys more   Do chemicals make us couch potatoes?   New CRISPR-Cas9 strategy edits genes 2 ways   Depression gene has a silver lining   Grieving before conception — risk to infant?   Decoding cell division   Two genes play major role in growth and cancers   The grandmother hypothesis   The black box at the beginning of life   A new method to turn genes off and on   New molecule found to prevent preterm birth   What steers evolution? Genes, then nature, then genes..    3-D printed organoids - first step to building organs   Come here, and be quiet!   How neurons branch   Childhood Vaccination Reduces Leukemia   Risk  Fats help organize spinal cord  'Brainbow' reveals a surprising visual connection   Obesity and stillbirth   Arsenic in drinking water links early puberty and obesity   Do sperm wield tiny harpoons? Aug 31, 2015    Building a safer stem cell   How zebrafish rebuild their amputated fins   Batting practice in the genome   Algorithm identifies gene movement around the clock   About that Paleo diet, eat some carbs!   Infertility of middle-aged mice can be reversed   Pre-pregnancy factors affect two generations   Engineering a solution to genetic diseases  Ultrasound has potential to detect preterm labor   One protein keeps cells both static and moving!   What controls our waking up and going to sleep?   How can labor contractions keep growing stronger?  Resurrecting ancient viruses to improve gene therapy   Skin stem cells coaxed to become Schwann cells    How a single genetic mutation can cause autism   Surprising light on genetic causes for cerebral palsy   Drinking at conception boosts diabetes risk for baby   Altered brain growth in autism spectrum disorder    Stem cells one step closer to curing genetic disease    Simple flip of a genetic switch begins aging   Stressed birds stop looking to parents, turn to flock   July 2015  'Miniature brains' from skin cells explain autism Birth order not meaningful to personality or IQ   Genetic roots of scoliosis   Reverse hearing loss?   Mind the gap!  Bad genes don't always lead to same outcomes  How is temperature affecting mammal moms?  Sialic acid is key to unlocking brain disorders   Metformin does not reduce baby birthweights  Binge-eating cavefish share gene mutation with us   Hippo dances to hormones  How good is your eyesight? CEP63 Gene key to brain development and fertility  Geometry of brain’s surface matches gene heritage 'Avandia' to be clinically tested for preeclampsia  Determining the front and back of a cell  Long-term memory maintained by prion-like proteins  Autism affects neural pathways and brain shape Fine tuning the brain  REM sleep critical to young brain development   Brain size/intelligence controlled by a single gene   Stressed moms alter babys' gut and brain   Placenta-on-a-chip  June 2015   Educate mom, reduce unintended pregnancies  Picky eaters — a serious problem for some New Noninvasive and effective Prenatal Testing Strong working memory can reduce teen sex?   Gene mutation triggers lymphoblastic leukemia  Sun's coronal gases may harm our health  Cat videos make you 'feel-good' and boost energy!  Humans, we may have a built-in GPS in our nose  Low glycemic index diet reduces autism symptoms   Common pesticide linked to ADHD — in boys  Artificial intelligence regenerates planaria  Egg or sperm? That is the question...  Mutations can spontaneously occur in early embryos  Progeria syndrome truly a disease of aging  Infant brains develop faster than we thought  The Secret to a Longer Life? Be Female   Motherhood permanently alters your brain  Genes can predict a woman's first birth  Genetic mutation link to autism might be undone  Why and how to barcode thousands of cells  Clues to how human neurovascular unit forms    Mothers coo while fathers say cool