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Prenatal Development . Weeks 1-40 . Conception. Ovum: female cell or egg Uterus: organ in a woman’s body in which the baby develops Sperm: male cell Conception: when the ovum and the sperm unite Ovum lives up to 24 hours after release from ovary

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Presentation Transcript
  • Ovum: female cell or egg
  • Uterus: organ in a woman’s body in which the baby develops
  • Sperm: male cell
  • Conception: when the ovum and the sperm unite
    • Ovum lives up to 24 hours after release from ovary
    • Sperm lives up to 72 hours after release from male
week 1
Week 1
  • The first week is your menstrual period.
  • Your pregnancy will be dated from this:
    • Most women don't know the precise moment they have ovulated or conceived.
    • Most do remember the first day of their last menstrual period.
week 2
Week 2
  • The very end of the second week marks the release of the egg—ovulation
  • 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
Week 3
  • 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."
  • Some women can tell when they ovulate by noting mild cramping or pain or increased vaginal discharge.
  • Once the egg has been released, it must be fertilized for you to become pregnant.
  • The egg is fertilized early in the third week and typically implants in the uterus 6-12 days after ovulation.
stages of the zygote
Stages of the Zygote
  • Zygote is the fertilized egg
  • Cells will divide at rapid rate
  • Within 5 days there will be over 500 cells.
  • Travels down fallopian tube and attaches to uterus
  • This stage last only 2 weeks
  • About the size of a pin head.
stage of the embryo
Stage of the Embryo
  • Lasts from the time the cells attach to uterus to week 12.
  • Embryo: ball of rapidly multiplying cells
  • Almost all of the internal organs begin to develop during this six-week stage
  • Embryo also becomes enclosed in a fluid-filled pouch called the amniotic sac.
embryo key terms
Embryo Key Terms
  • Placenta: tissue connecting the embryo to the uterine wall.
  • Umbilical cord: attaches the embryo the the placenta.
  • Amniotic fluid: fluid inside amniotic sac. Protects the developing baby from falls that a mother might have.
week 4
Week 4
  • The fertilized egg is a fluid-filled cluster of rapidly multiplying cells.
  • The egg tunnels into the uterus where it promptly divides into two parts.
    • Half the egg attaches to the uterine wall and develops into the placenta
      • will transport oxygen and nutrients to your baby
      • Transports waste products away from your little
    • The other half will develop into the embryo, which will later become the fetus.
  • During this week the following occurs:
    • 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.
    • Brain section development. At the other end, the tube enlarges to form the brain's major sections.
  • What's happening with you
    • Pregnancy symptoms
    • Missed period and possible spotting
week 5
Week 5

What’s happening with you.

Just a bit bigger than an apple seed.

Embryo' has already divided into three layers

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

The middle layer. These cells will produce the circulatory system, bones, most muscles, cartilage, sex organs and kidneys.

The bottom layer. These cells will form the lungs, intestines and beginnings of the urinary system.

Missed period. You should have missed your period or have experienced slight spotting.

Pregnancy symptoms. As your blood flow works to catch up with your rapidly expanding circulatory system, you may experience morning sickness (nausea), and fatigue.

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.

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.

Your baby’s growth:

Embryo cell layers

week 6
Week 6

Your body

About the size of a kidney bean.

Developing this week:

Eye retina is forming

Neural tube




Larynx and inner ear

Neck and lower jaw

Facial features



Breast changes.

Become larger and more sensitive.

Tingling sensations

Areola may start to darken.

Weight change.

May have gained two or three pounds..

Morning sickness.

May get worse this week as your hormone levels rise.

Perfectly normal for nausea to appear at any point of the day or night.

Your baby’s growth

week 7
Week 7

Your body

About 1 inch long.

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.

Facial features








Weight gain

Morning sickness

More bathroom breaks

Increased energy

Your baby’s growth

week 8
Week 8

Your body

Head will become more rounded as the embryo begins to look more like a baby.

Body begins to fine-tune its bone, joint and limb development, and tiny finger and toe buds appear.

Eyelids are forming


Blood beginning to flow

Digestive tract continues to develop

Gonads transform into either testes or ovaries






Rollercoaster of emotions

Breast enlargement and bigger waistline


First doctor’s visit

Your baby’s growth

week 9
Week 9

Your body

About the size of a peapod and weighs a little less than half an ounce.

Muscles, nerves and organs are forming.

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.

Increased body growth


Digestive system




Increased blood volume





Your baby’s growth

week 10
Week 10

Your body


Reproductive organs

Nervous system

Internal organs


Taste buds


Upper lip


Still in regular clothes

Fatigue and nausea

Baby’s growth

week 11
Week 11

Your body







Brain nerve cells connecting

All major organs will be fully developed

Spinal nerves


Uterus expansion

Waist growth

Skin changes: dark line on abdomen

Hair and nail changes

Baby’s growth

week 12
Week 12

Your body

Had developed a facial profile




Digestive process


Pituitary gland with begin to produce hormones

Hair (lanugo) will appear all over the body

Uterus enlargement

Skin radiance

Skin problems

Nausea and fatigue goes away

Weight gain

Baby’s growth

  • You have concluded the 1st trimester!
  • All body parts are in place, it will just continue to grow.
stage of the fetus
Stage of the Fetus
  • 3rd and final stage of prenatal development
  • Weeks 9-40
  • Unborn child is called fetus
  • Body, head, arms, and legs grow rapidly
  • Organs continue to develop for blood circulation, breathing, and digestion