prenatal development weeks 1-40. conception o ovum: female cell or egg o uterus: organ in a...
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Prenatal Development
Weeks 1-40
ConceptionO Ovum: female cell or eggO Uterus: organ in a woman’s body in
which the baby developsO Sperm: male cellO Conception: when the ovum and the
sperm uniteO Ovum lives up to 24 hours after release
from ovaryO Sperm lives up to 72 hours after release
from male
Week 1 O The first week is your menstrual
period. O Your pregnancy will be dated from
this:O Most women don't know the precise
moment they have ovulated or conceived.
O Most do remember the first day of their last menstrual period.
Week 2 O The very end of the second week
marks the release of the egg—ovulation
O At this point in your cycle, your uterine lining is developing under the influence of hormone your body secretes to make it receptive to the fertilized egg.
Week 3
O Right between weeks two and three (about day 14 of a 28-day cycle) an egg will be released into your fallopian tube—this is called "ovulation."
O Some women can tell when they ovulate by noting mild cramping or pain or increased vaginal discharge.
O Once the egg has been released, it must be fertilized for you to become pregnant.
O The egg is fertilized early in the third week and typically implants in the uterus 6-12 days after ovulation.
Stages of the Zygote O Zygote is the fertilized eggO Cells will divide at rapid rateO Within 5 days there will be over 500
cells.O Travels down fallopian tube and
attaches to uterusO This stage last only 2 weeksO About the size of a pin head.
Stage of the EmbryoO Lasts from the time the cells attach
to uterus to week 12. O Embryo: ball of rapidly multiplying
cellsO Almost all of the internal organs
begin to develop during this six-week stage
O Embryo also becomes enclosed in a fluid-filled pouch called the amniotic sac.
Embryo Key TermsO Placenta: tissue connecting the
embryo to the uterine wall.O Umbilical cord: attaches the embryo
the the placenta.O Amniotic fluid: fluid inside amniotic
sac. Protects the developing baby from falls that a mother might have.
Week 4O The fertilized egg is a fluid-filled cluster of rapidly multiplying cells. O The egg tunnels into the uterus where it promptly divides into two
parts. O Half the egg attaches to the uterine wall and develops into the
placentaO will transport oxygen and nutrients to your babyO Transports waste products away from your little
O The other half will develop into the embryo, which will later become the fetus.
O During this week the following occurs:O Spinal cord development. A sheet of cells on the back of the embryo
folds in the middle to form a tube that will become the baby's spinal cord.
O Brain section development. At the other end, the tube enlarges to form the brain's major sections.
O What's happening with youO Pregnancy symptomsO Missed period and possible spotting
Week 5 Your baby’s
growth: Embryo cell layers
What’s happening with you.
O Just a bit bigger than an apple seed. O Embryo' has already divided into
three layersO The top layer: Neural folds create
a tube which will form the front part of brain, the heart which will beat this week, and the spinal cord and back bone
O The middle layer. These cells will produce the circulatory system, bones, most muscles, cartilage, sex organs and kidneys.
O The bottom layer. These cells will form the lungs, intestines and beginnings of the urinary system.
O Missed period. You should have missed your period or have experienced slight spotting.
O Pregnancy symptoms. As your blood flow works to catch up with your rapidly expanding circulatory system, you may experience morning sickness (nausea), and fatigue.
O Unappetizing smells and tastes. It may help to avoid foods with very strong smells or tastes, such as oily or fried foods and spicy dishes. Even strong-smelling cleaners and disinfectants may bother you right now.
O If you aren't experiencing these symptoms, don't be concerned. You may be one of the lucky moms who sail through early pregnancy without feeling nauseous at all.
Week 6Your baby’s growth Your body
O About the size of a kidney bean.
O Developing this week:O Eye retina is formingO Neural tube O HeartO LimbsO BrainO Larynx and inner earO Neck and lower jawO Facial featuresO OrgansO Placenta
O Breast changes. O Become larger and more
sensitive. O Tingling sensations O Areola may start to darken.
O Weight change.O May have gained two or three
pounds.. O Morning sickness.
O May get worse this week as your hormone levels rise.
O Perfectly normal for nausea to appear at any point of the day or night.
Week 7 Your baby’s
growth Your body O About 1 inch long. O Fetal digestive system is beginning
to develop. The umbilical cord, has started taking shape. This ropelike cord contains two arteries and a vein. It brings oxygen and nutrients to the embryo and carries away waste products.
O Facial featuresO EarsO EyesO Head O HeartO AirwaysO MouthO Skin
O Weight gainO Morning sicknessO More bathroom
breaksO Increased energy
Week 8 Your baby’s
growth Your body O Head will become more rounded as
the embryo begins to look more like a baby.
O Body begins to fine-tune its bone, joint and limb development, and tiny finger and toe buds appear.
O Eyelids are formingO NoseO Blood beginning to flowO Digestive tract continues to developO Gonads transform into either testes or
ovariesO EarsO ElbowsO VertebraeO MusclesO Skin
O Rollercoaster of emotions
O Breast enlargement and bigger waistline
O CrampingO First doctor’s visit
Week 9Your baby’s
growth Your body O About the size of a peapod and
weighs a little less than half an ounce.
O Muscles, nerves and organs are forming.
O Genitals are beginning to develop, but it's still almost impossible to tell on ultrasound whether you're going to have a boy or a girl.
O Increased body growthO DigitsO Digestive system O EyelidsO EarsO Brain
O Increased blood volume
O FatigueO Testing
O CVSO Amniocentesis
Week 10
Baby’s growth Your body O TeethO Reproductive organsO Nervous systemO Internal organsO IntestinesO Taste budsO EyelidsO Upper lipO Joints
O Still in regular clothes
O Fatigue and nausea
Week 11
Baby’s growth Your bodyO FingernailsO EarsO GenitaliaO SwallowO KickO BonesO Brain nerve cells connectingO All major organs will be fully
developedO Spinal nervesO Heartbeat
O Uterus expansion O Waist growthO Skin changes:
dark line on abdomen
O Hair and nail changes
Week 12
Baby’s growth Your body O Had developed a facial
profileO KidneysO PancreasO LiverO Digestive processO BrainO Pituitary gland with begin to
produce hormonesO Hair (lanugo) will appear all
over the body
O Uterus enlargement
O Skin radianceO Skin problemsO Nausea and
fatigue goes awayO Weight gain
Congrats!O You have concluded the 1st trimester!O All body parts are in place, it will just
continue to grow.
Stage of the Fetus O 3rd and final stage of prenatal
development O Weeks 9-40O Unborn child is called fetusO Body, head, arms, and legs grow
rapidlyO Organs continue to develop for blood
circulation, breathing, and digestion
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