the different stages of foetal development is dealt here.

1. STAGES OF FOETAL
DEVELOPMENT
Presented by,
D.Irene
16PGZ001,

2. AMAZING FACTS!!
• Amazing Fact: At fertilization, every bit of genetic information necessary for the
child's development is present. The "program" for everything is there: hair and eye
color, skin tone, height - even likely giftedness as a pianist, vocalist or computer
programmer.
• Amazing Fact: It's a good thing this blazingly fast growth rate slows down after the
second month, otherwise the baby's birth weight would exceed 10 tons!
• Amazing Fact: What was that noise? At 15 weeks, loud sounds may actually cause
baby to startle
• Fetus may have different sleep wake cycle. Chances are after baby is born, he or she
will want to be active about this same time!

3. 1.Early embryo 2.implantation 3.Neurulation 4.Neural crest
differentiation
5.Development of neural
cranial nerves
6.Development of eyelid,
olfactory nerves,
diaphragm
7. Development of
liver, ventricular
system, and genitals
in females
8.Development of axial
skeleton, abdominal
wall, stomach.

4. EMBRYONIC PEROID (WEEK1-WEEK8)
WEEK
1.Fertilization
and blastocyst
formation
2.Implantation
3.Neurulation and
neural crest.
4.Heart begins to
pump. Diaphragm
forms5.pituitary.
Heart septum
Liver
Eye lens
Abdominal wall
6.Limb buds
Muscle and bone tissue
Smell and olfactory
nerves
7.Pancreas, bile
ducts, eyelids and
genitals.
8. Body - straightening
of trunk, umbilical cord,
intestines herniated at
umbilicus

5. FETAL PERIOD (WEEK9-WEEK40)
• Weeks 9-12
• Fingers and toes are developing
• Hands and arms have almost reached
their relative length but the legs and feet
are still developing
• Liver begins making red blood cells but
by the end of 12 weeks the spleen takes
over
Bones and muscles are developing
• Intestines are developing.
Weeks 13-16
• Rapid growth
• Coordinated limb movements
• External genitalia has formed
• Kidneys are functioning and
making urine
• Hair on scalp, eyebrows, and
eyelashes
• Fetus can swallow amniotic fluid
and can hear
• Baby’s heart establishes a normal
rhythm

6. • Weeks 17-20
• The sucking reflex is developed and fetus
may suck on their hand or finger
• Quickening or fetal movements can be
felt by mom
• Fetus is covered by a thick, waxy
substance called vernix -this protects its
fragile skin
• Fetus is covered in lanugo or soft, downy
hair that helps vernix stay on the skin
• Brown fat that will be used for heat
production in the newborn period begins
to form
• Fetus has regular sleep and wake cycles
• Ultrasound can help determine the sex of
the baby
• Weeks 21-24
• Brain is growing at a rapid
pace
• Eyes are beginning to open
• Lungs sacs are formed but
not mature enough to
function properly
• Lung size increases rapidly

7. • Weeks 25-28
• Surfactant (a substance
that assists with lung
expansion and patency) is
secreted
• Lanugo (the baby’s soft
downy hair) is
disappearing
• By the end of the 28th
week, bone marrow takes
over red blood cell
production
• Weeks 29-32
• Rapid weight gain with the
development of
subcutaneous (below the
skin) fat
• With the exception of the
skull, bones begin to harden
• Brain is still developing
with the regions
differentiating
• Fetus is able to hiccup

8. • Weeks 33-36
• Brain is still developing
• Lungs are still maturing and
proliferating
• Skin is less wrinkly
• At 34 weeks, fetus can begin to
coordinate suck, swallow, and
breath patterns
• At 36 weeks, rapid increase in
glycogen stores in the liver –
glycogen is the main source of
fuel for the baby’s developing
brain
• Weeks 37-birth
• Brain and lungs are still
developing
• Baby is gaining weight and
accumulating more fat
• Fetus is lower in the pelvis
in preparation for birth

9. Week of gestation Size and weight of the fetus
Week -9 2.3cm long and weigh about 2g Week-34 45cm and 2.1kg
Week- 10 3.1cm weighs nearly 4g Week-35 46.2cm and 2.4kg
Week- 11 4.1cm and 8g Week-36 47.4cm and 2.6kg
Week- 12 5.4cm and weighs up to 14g Week- 37 48.6cm and 2.9kg
Week-13 4cm weighs nearly 23g Week-38 49.8cm and 3kg
Week 14 8.7cm and weighs around 43g Week-39 50.7cm and 3.3kg
Week-15 8.7cm and weighs around 43g
Week-16 11.6cm and weighs about 100g
Week-17 13cm and weighs about 140g
Week-18 14.2cm and weighs up to 190g
Week-20 25.6cm and weighs about 300g
Week-21 26.7cm long and weighs 360g
Week-22 27.8cm and weighs 430g
Week-23 28.9cm and weighs 500g
Week-24 30cm and weighs 600g
Week-25 34.6cm and weighs 660g
Week-26 35.6cm and weighs 760g
Week-27 36.6cm and weighs 875g
Week -28 37.6cm and weighs 1kg
Week-30 1.1kg and is about 38.6cm
Week-31 41.1cm and 1.5kg https://www.babycentre.co.uk/6-weeks-pregnant
Week-32 42.4cm and 1.7kg
Week-33 43.7cm and 1.9kg

10. CONCLUSION

11. REFERENCES
• https://www.babycentre.co.uk/40-weeks-pregnant
• https://www.pretrm.com/fetal-development-by-week.html
• Merenstein, Gerard B., and Sandra L. Gardner. Neonatal Intensive Care. 6th ed. St.
Louis: Mosby Elsevier, 2006. Print.
• https://medlineplus.gov/ency/article/002398.htmhttps://www.pretrm.com/fetal-
development-by-week.html