Prenatal Development
1st Grade Summer Story
http://www.whattoexpect.com/pregnancy/week-by-week/landing-weeks.aspx
http://www.babycenter.com/
http://www.healthguru.com/
Prenatal Development
From
conception to
birth….
the 40 week
miracle!!
Review
1. Ovulation has occurred in the female
body. The egg is transported down the
fallopian tube.
 Fertilization takes place in the F_____.
Only one S ____ may penetrate the
O____. Conception has occurred!

If more than one ovum is present, they may
both be Fer_____ and this will cause
multiple births.
 A fertilized ovum will implant itself in
the U__________ and begin to develop.
 Beginning of life!
Look Who’s talking
Congratulations! Your Pregnant
Online Pregnancy Test Link
Signs and Symptoms of Pregnancy
Headaches
Sensitive to smells
Frequent urination
Tender, tingling,
swollen breast
Spotting
Fatigue
Enlarging uterus
and abdomen
Food cravings
Period stops
Morning sickness
Glowing
Irritability
Putting on weight
Mood swings
Acne
Dizzy
Figuring your due date
 Take the first day of your last period

February 7th
 Go back 3 months

November 7th
 Add 7 days
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November 14th

Give or take 2 weeks
Pre-Natal Development
 Growth of the baby from conception to birth

40 weeks, 10 months, 280 days, 3 trimesters.
 Very rapid: goes from the size of a pencil dot (one
cell) to a 7 ½ pound (200 billion cells) in 9 months.
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4 weeks = poppy seed, 5 weeks = grain of rice, 7 weeks
= blueberry, 14 weeks = apple, 15 weeks = orange, 39
weeks = watermelon
If this rate of growth continued past birth, the baby
would weigh 160 lbs by its first birthday.
Paper people winners
3 Trimesters
(about 13 weeks each)
• 1st Trimester
– focus is on physical
development
• 3rd Trimester
– Define ovum, sperm,
– Continues to grow and
conception/fertilization
practice using body and
– The greatest time of risk and
bodily functions
vulnerability for birth defects to
– Define
the developing fetus.
• Vernix and
• Lightening
• 2nd Trimester
– Increased organ development
– Define
• Quickening
• Lanugo
– Physically the easiest on the
Mom
– Physically the most
demanding on Mom
Prenatal Terms
Embryo (weeks 3-8)
Zygote (week 0-2)
Fetus (weeks 9-40)
Belly People
Station 2 Pregnancy House
Use this link to help you fill in this portion of your study guide
http://www.whattoexpect.com/pregnancy/week-by-week/landing-weeks.aspx
Station 2 Month at a Time
Month 0
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Begins 3 weeks after 1st day of last period
Ovulation occurred and the egg/ovum was released
Sperm (several hundred million) deposited into female’s
body and begins travel to find the egg in the fallopian tube.
The sperm beats against the ovum membrane
Sperm sheds its tail and burrows inside.
2 cells now become one and begin to quickly divide to form
a human being.
Begins to travel down the fallopian tube and 5-7 days after
conception, the zygote implants itself into the endometrial
lining
Human Egg with Coronal Cells
This image is of a purple human egg
sitting on a pin. The egg is coated with
the zona pellicuda, a glycoprotein that
protects the egg but also helps to trap
and bind sperm. Two coronal cells are
attached to the zona pellicuda.
Sperm on the Surface of a Human
Egg trying to fertilize an egg.
Human Zygote and Sperm
It looks like the world at war, but it is actually
five days after the fertilization of an egg,
with some remaining sperm cells still sticking
around. The embryo and sperm cell nuclei are
stained purple while sperm tails are green.
The blue areas are gap junctions,
which form connections between the cells.
Colored Image of a 6
day old Human Zygote
Implanting
First Month for Baby
 Zygote travels into the
uterus.
 Rapid cell division.
 Embryo implants into
uterus.
 Heart begins to beat.
 Nervous system.
Month 1 Events for Baby
 Embryo phase begins
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Days after conception:
9 – begins to take shape
17 – has blood cells
18 – occasional heart
pulsation
19 – eyes start to
develop
20 – nervous system
foundation set
24 – vital organs begin
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25 – heart beats regularly
28 – 40 pairs of muscles,
limb buds, trunk of body is
formed
30 – develops ears and
nose
31 – hand, arm, shoulder
region formed
33 – hand section formed
Baby ¼” long (length of
rice)
4 Weeks
By the end of the
First Month for Mom
 Misses her period.
 Already 2 weeks
pregnant when she
skips a period.
 Changes in estrogen &
progesterone levels.
Month 2 Events
▪Internal organs and neural system still forming
▪Blood is circulating
▪Still days after conception
40 days – body movements visible by ultrasound
42 days – skeleton complete
43 days – brain puts off electrical brain waves
49 days – has a miniature doll appearance
56 days – moves, squints, swallows, yawns, and tongue moves
▪Baby is 1.5” long
Second Month for Mom
 Nausea/Vomitting
(Morning Sickness)
 Frequent urination
 Mood swings
Second Month for Baby
 Head develops rapidly.
 Face, eyes, and ears
take shape.
 Internal organs
 Sex organs.
 Arm & leg buds.
 Nails are forming
 1 inch 1/10 oz.
Nutrition for a Pregnant
Woman - Link
http://www.mypyramid.gov/mypyramidmoms/index.html
Third Month for Mom
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Continued nausea.
Frequent urination.
Cravings.
Increased appetite.
Third Month for Baby
 Head grows rapidly.
 Bone formation.
 Digestive organs
function.
 Arms, legs and fingers
move.
 3 inches 1 oz.
End of the First Trimester
 Time for mom to
adjust to pregnancy.
 Baby grows most
rapidly.
 All internal organs are
complete.
 Mom must be very
careful with health.
Fourth Month for Mom
 Body is adjusted to
pregnancy.
 Increased appetite.
 Gained 2-4 lbs.
 Clothes fitting snug.
Fourth Month for Baby
 Bones harden.
 Actively moving.
 Lower parts of body
grow rapidly.
 Sex organs fully
formed.
 Heartbeat detected.
 7 inches 5 oz.
Fifth Month for Mom
 Mild back-aches.
 Size change is obvious
to others.
 Hears heart beat.
 Ultrasound.
 Feels movement.
 Gains 5-8 lbs.
Fifth Month for Baby
 Lanugo hair.
 Vernix.
 Ears and nose develop
cartilage.
 Finger and toe nails.
 Can suck thumb,
hiccup, and kick.
 12 inches 14 oz.
Sixth Month for Mom
 Increased need for
sleep.
 Gained 10-12 lbs.
Sixth Month for Baby
 Eyes and eyelids fully
formed.
 Fat developing under
skin.
 Practices breathing
movements.
 14 inches 2 pounds
End of Second Trimester
 Baby continues to
develop and grow.
 Mom feels good.
 Easiest trimester for
mom and baby.
Seventh Month for Mom
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Effects posture.
Leg cramps.
Back-aches.
Waddling.
Gains 12-15 pounds.
Seventh Month for Baby
 Brain developing
rapidly.
 Inhales amniotic fluid
to develop lungs.
 Gaining lots of weight.
 17 inches 3 pounds
Eighth Month for Mom
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Heartburn.
Difficulty breathing.
Multiple small meals.
Increased urination.
Back, leg and muscle
aches.
 Gains 15-20 pounds.
Eighth Month for Baby
 Fat is stored for later
use.
 Fingernails reach
beyond fingertips.
 Rapid growth.
 Sheds vernix & lanugo.
 17 inches 5 pounds
Ninth Month for Mom
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Baby drops into pelvis.
Contractions.
Gains 20-30 pounds.
Gives birth!!!!
Ninth Month for Baby
 Organ system fully
functional.
 Vernix covers entire
body.
 Settle into head-down
position for birth.
 21 inches 7 pounds
End of Third Trimester
 Most difficult for
mom.
 Baby gains weight
rapidly.
 Both are ready for
birth!
Welcome to the World!
Octo-Mom Birth Link