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Week 3 of gestation 
(embryo development); 
week 5 of pregnancy: 
• The brain, spinal cord, 
and heart begin to 
develop. 
• The gastrointestinal tract 
begins to develop.
Weeks 4 to 5 of gestation; 
week 6 - 7 of pregnancy: 
• Arm and leg buds become 
visible. 
• The brain develops into 
five areas and some 
cranial nerves are visible. 
• The eyes and ear 
structures begin to form. 
• Tissue forms that 
develops into the vertebra 
and some other bones. 
• The heart continues to 
develop and now beats at 
a regular rhythm. 
• Rudimentary blood moves 
through the main vessels.
Week 6 of gestation; week 
8 of pregnancy: 
• The arms and legs have 
grown longer, and foot 
and hand areas can be 
distinguished. 
• The hands and feet have 
fingers and toes (digits), 
but may still be webbed. 
• The brain continues to 
form. 
• The lungs begin to form.
Week 8 of gestation; 
week 10 of pregnancy: 
• The eyelids are more 
developed. 
• External features of 
the ear begin to take 
their final shape. 
• Facial features 
continue to develop. 
• The intestines rotate.
Weeks 9 to 12 of gestation; 
weeks 11 to 14 of pregnancy: 
• Eyelids close and will not 
reopen until about the 28th 
week. 
• The face is well formed. 
• Limbs are long and thin. 
• Genitals appear well 
differentiated. 
• Red blood cells are produced in 
the liver. 
• The head makes up nearly half 
of the baby's size. 
• The baby can make a fist with 
its fingers. 
• Tooth buds appear for the baby 
teeth.
Weeks 13 to 19 of gestation; 
weeks 15 to 21 of pregnancy: 
• The skin is almost transparent. 
• Fine hair called lanugo develops on 
the head. 
• Meconium is made in the intestinal 
tract. 
• More muscle tissue and bones have 
developed, and the bones become 
harder. 
• The baby begins to make active 
movements. 
• The liver and pancreas produce fluid 
secretions. 
• Sucking motions are made with the 
mouth. 
• The baby can hear. 
• The baby makes more movements. 
• The mother may feel a fluttering in 
the lower abdomen.
Week 20 to 23 of gestation; 
week 22 to 25 of pregnancy: 
• Lanugo hair covers entire body. 
• Eyebrows and lashes appear. 
• Nails appear on the fingers and toes. 
• The baby is more active with 
increased muscle development. 
• The mother can feel the baby 
moving. 
• The fetal heartbeat can be heard with 
a stethoscope. 
• Bone marrow begins to make blood 
cells. 
• The lower airways of the baby's lungs 
develop but still do not produce 
surfactant (a substance that allows 
the alveoli to open for gas exchange). 
• The baby begins to store fat.
Week 24 to 28 of gestation; 
week 25 to 30 of pregnancy: 
• Eyebrows and eyelashes are well 
formed. 
• All eye parts are developed. 
• The baby has a hand and startle 
reflex. 
• Footprints and fingerprints are 
forming. 
• Air sacs form in lungs. 
• Rapid brain development occurs. 
• The nervous system is developed 
enough to control some body 
functions. 
• The eyelids open and close. 
• The respiratory system, while 
immature, has developed to the 
point where gas exchange is 
possible.
Weeks 29 to 40 of gestation; 
weeks 31 to 42 of pregnancy: 
• A rapid increase in the amount of 
body fat occurs. 
• Rhythmic breathing movements 
occur, but the lungs are not fully 
mature. 
• The bones are fully developed, but 
still soft and pliable. 
• The baby's body begins storing iron, 
calcium, and phosphorus. 
• Body fat increases. 
• Fingernails reach the end of the 
fingertips. 
• Lanugo is gone except for on the 
upper arms and shoulders. 
• Fingernails extend beyond 
fingertips. 
• Small breast buds are present on 
both sexes. 
• Head hair is now coarse and thicker.

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Week 2

  • 1.
  • 2.
  • 3. Week 3 of gestation (embryo development); week 5 of pregnancy: • The brain, spinal cord, and heart begin to develop. • The gastrointestinal tract begins to develop.
  • 4. Weeks 4 to 5 of gestation; week 6 - 7 of pregnancy: • Arm and leg buds become visible. • The brain develops into five areas and some cranial nerves are visible. • The eyes and ear structures begin to form. • Tissue forms that develops into the vertebra and some other bones. • The heart continues to develop and now beats at a regular rhythm. • Rudimentary blood moves through the main vessels.
  • 5. Week 6 of gestation; week 8 of pregnancy: • The arms and legs have grown longer, and foot and hand areas can be distinguished. • The hands and feet have fingers and toes (digits), but may still be webbed. • The brain continues to form. • The lungs begin to form.
  • 6. Week 8 of gestation; week 10 of pregnancy: • The eyelids are more developed. • External features of the ear begin to take their final shape. • Facial features continue to develop. • The intestines rotate.
  • 7. Weeks 9 to 12 of gestation; weeks 11 to 14 of pregnancy: • Eyelids close and will not reopen until about the 28th week. • The face is well formed. • Limbs are long and thin. • Genitals appear well differentiated. • Red blood cells are produced in the liver. • The head makes up nearly half of the baby's size. • The baby can make a fist with its fingers. • Tooth buds appear for the baby teeth.
  • 8. Weeks 13 to 19 of gestation; weeks 15 to 21 of pregnancy: • The skin is almost transparent. • Fine hair called lanugo develops on the head. • Meconium is made in the intestinal tract. • More muscle tissue and bones have developed, and the bones become harder. • The baby begins to make active movements. • The liver and pancreas produce fluid secretions. • Sucking motions are made with the mouth. • The baby can hear. • The baby makes more movements. • The mother may feel a fluttering in the lower abdomen.
  • 9. Week 20 to 23 of gestation; week 22 to 25 of pregnancy: • Lanugo hair covers entire body. • Eyebrows and lashes appear. • Nails appear on the fingers and toes. • The baby is more active with increased muscle development. • The mother can feel the baby moving. • The fetal heartbeat can be heard with a stethoscope. • Bone marrow begins to make blood cells. • The lower airways of the baby's lungs develop but still do not produce surfactant (a substance that allows the alveoli to open for gas exchange). • The baby begins to store fat.
  • 10. Week 24 to 28 of gestation; week 25 to 30 of pregnancy: • Eyebrows and eyelashes are well formed. • All eye parts are developed. • The baby has a hand and startle reflex. • Footprints and fingerprints are forming. • Air sacs form in lungs. • Rapid brain development occurs. • The nervous system is developed enough to control some body functions. • The eyelids open and close. • The respiratory system, while immature, has developed to the point where gas exchange is possible.
  • 11. Weeks 29 to 40 of gestation; weeks 31 to 42 of pregnancy: • A rapid increase in the amount of body fat occurs. • Rhythmic breathing movements occur, but the lungs are not fully mature. • The bones are fully developed, but still soft and pliable. • The baby's body begins storing iron, calcium, and phosphorus. • Body fat increases. • Fingernails reach the end of the fingertips. • Lanugo is gone except for on the upper arms and shoulders. • Fingernails extend beyond fingertips. • Small breast buds are present on both sexes. • Head hair is now coarse and thicker.