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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 beginningHead may position into pelvisWhite 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 Jul 1, 2015   Stressed moms alter babys' gut and brain  Placenta-on-a-chip  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   Supplement may prevent alcohol-related defects  Alcohol damage before mom knows of pregnancy  Hydrogels boost stem cells to heal brains  Mom's obesity compromises infant immune system  Risk of preterm delivery for women born preterm Acetaminophen can lower testosterone in fetal boys  DNA reveals impact of malnutrition on fetus  Taking immortality out of cancer  Genome editing could cure sickle cell anemia  Brain cells are capable of switching "careers"  C-section knocks out infant gut microbiome   Placenta protects baby with transporter proteins  Shedding new light on reproductive disorders  How our brain plugs in vision stabilization  How to stop "jumping genes" in stem cells  Parent training reduces autism behavioral problems  Replace 1 sugar drink a day - cut risk of diabetes  Engineering new blood vessels is closer to reality  Cell mitochondria are key to stem cell development  How come we are warm-blooded?  Most People Carry Recessive Disease Mutations  Link between physical forces and limb deformities  Genetics behind fetal overgrowth syndrome found  Mitochondrial genes and disease inheritance How young cells learn to communicate How oxytocin makes a mom  Stem cell based birth defect can repair facial bones   How zinc deficiency affects embryo and adults  Found — proteins critical for DNA repair   Breast cancer and the fountain of youth  Newborn brain is altered by mom's use of cocaine Dad's sperm may hold clues to autism  How electrical charges move through DNA  When using our brain muddles solving a problem  Autism's early 'neighborhood'  Food allergies can be transmitted through blood  A method for blocking pregnancy loss?  Why we are becoming myopic  How do lifeforms know how to be the right size?  New clues on origin of Hirschsprung's disease   About Congenital Diaphragmatic Hernia  Some birth defects due to shattered chromosomes Why we need to make neurons from stem cells  A link between autism and higher intelligence  Solving the "obstetrical dilemma"  Inducing pluripotent stem cells to reprogram  Radical vaccine against herpes viruses  Leukemia cells changed into harmless immune cells  Infant leukemia results from one rearranged gene  Mom's age at childbirth affects boy baby as adult  How dieting and fasting turn off inflammation  A mutation that can cause male infertility   How to build a gene location APP  Bioelectricity key in brain development and repair  Low Omega-3 and Vitamin D affects brain serotonin  DNA-binding protein critical to normal embryo  Developing a sense of taste  Mechanical stress is key in cell to cell fusion  New hormone mimics the effects of exercise  Detecting mutations in IVF embryos  Master switch' error causes CHOPS syndrome  Epigenome orchestrates embryo development  Tobacco smoke and preemies with lung disease  Exercise ball decreases labor time and C-sections  Why some older mothers' babies have birth defects   Cerebral palsy – it can be in your genes  Baby formula poses arsenic threat to newborns  The neural basis for 'being in the mood'  Evolving a bigger brain with human DNA  Angelman Syndrome and our Circadian clocks  Reversing effects of obesity on female fertility  Parents who smoke risk diabetes in unborn child  Baby’s own genes can trigger early birth  Growing a brain in 3-D  New protein linked to gestational diabetes  Secrets of how our kidneys develop  Babies understand complex social situations  Gene differences between male and female brains  Stress in pregnancy can affect baby's weight  Turning back aging in cells  Insecticides with pyrethroids linked to ADHD  A gene vital to the central nervous system  Sleep improves infant memory Personalized treatment for intellectual disability?  Things smell good for a reason...  Effects of thyroid disorders on reproductive health  BPA and estradiol affect sperm development  Caesarean delivery may hamper sex life  Turning stem cells into bones, cartilage & stroma  New way to detect genetic errors in IVF embryos?  Blocking GnIH could eliminate stress infertility  Some men only commit when women are scarce  How the rotavirus causes infection in children  How to reverse obesity and diabetes?  More sun means fewer children and grandchildren  Quitting smoking? Women — time quitting to your cycle!  Circadian rhythms regulate skin stem cells?  When DNA gets sent to "time-out"  How a crucial protein aids learning and memory  Exposure to cold 'switches' white fat to brown fat  'Biological clock' may be able to kill cancer cells  Molecular network identified underlying ASD  Enzyme SPPL3 helps activate our immune system  Egg and sperm cells made from human stem cells  High-fat diet in pregnancy harms stem cells in fetus  Genetic mutation cause of ovarian failure  Hormone replacement therapy for younger women?  12 Genes cause rare developmental disorders  Air pollution linked to increased autism risk  Trophoblasts - the first immune cells of pregnancy?  Expectant dads have hormone changes like moms  Context memory function in preterm babies  Cracking the code of brain development  23andMe sketches USA's genetic portrait 23andMe sketches genetic portrait of the USA Paxil — antidepressant has a hidden toxicity    Intestinal tract helps control weight Strategy for treating neurofibromatosis type 1  3-D maps reveal genes fold like 'origami'  PCBs may affect fetal brain  Discovered, stem cell code for specific tissue types  Scientists identify principal sensor for touch  "Designer" genes correct Muscular Dystrophy  Sperm quality decreases with age  Boys are more likely to be stillborn than girls  Excess protein may trigger schizophrenia    Folic acid before pregnancy reduces SGA babies  Evolutionary controls seen in thousands of genes   Two-cell embryos already "talk" about their future  Women's fertility linked to selenium in diet   Mom's presence changes genes in infant brain 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 Mitochondrial errors in children of older moms 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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