Major events that occur in prenatal development

Question 1

What is the size of the baby in the first month?

Answer 1

0.4 cm less than 1 gram

Question 2

What is the significant developments that take place in the first month?

Answer 2

• Spinal column and central nervous systems starts to form
• Appendages are represented by small limb buds
• Heart begins beating around day 22

Question 3

What size is the baby in the second month?

Answer 3

3 cm, 1 gram

Question 4

What are the significant developments that take place in the second month?

Answer 4

• Eyes form, but eyelids are fused shut
• Nose is flat
  *Head is nearly as large as the body
• Nostrils are evident but filled with mucus
• Limb buds form paddle like hands and form ridges
• Brain waves are detectable
• Bone growth begins
• Blood cells and major blood vessels form
• Genitals are present, but sexes are not yet distinguishable

Question 5

What is the size of the baby in the third month?

Answer 5

9 cm, 30 grams

Question 6

What are the significant developments that take place in the third month?

Answer 6

• Eyes are well developed, but eyelids are still fused shut
• Nose develops bridge
• Fetus swallows amniotic fluid and produces urine
• Sexes can be distinguished visually
• Limbs are well formed, with nails on fingers and toes
• External ears are present
• Fetus moves but not enough for the mother to feel it

Question 7

What is the size of the fetus in the fourth month?

Answer 7

14 cm and 100 grams

Question 8

What are the significant developments that take place in the fourth month?

Answer 8

• Face looks more distinctly human
• Body is larger in proportion to head
• Skin is bright
• Scalp has hair
• Joints are forming
• Lip exhibits sucking movements
• Heart beat can be heard with a stethoscope

Question 9

What is the size of the fetus in the fifth month?

Answer 9

19 cm - 200-450 g

Question 10

What are the significant developments that take place in the fifth month?

Answer 10

• Body is covered in hair (lanugo)
• Skin has oily secretion to protect it from amniotic fluid
• Fetus is now bent forward into fetal position
• Mother can feel fetal movements
• Skin is bright

Question 11

What is the size of the fetus in the sixth month?

Answer 11

• 27cm to 35 cm - 550-800g

Question 12

What is the significant developments that take place in the sixth month?

Answer 12

• Eyes are open
• Eyelashes form
• Skin is wrinkled, pink, translucent

Question 13

What is the size of the fetus in the seventh month?

Answer 13

32-42 cm/1100 to 1350 g

Question 14

what are the significant developments that take place in the seventh month?

Answer 14

• Skin is wrinkled and red
• Fetus turns to an upside down position
• Bone marrow is the only site for red blood cell formation
• Testes descend to scrotum
• Fetus can usually survive if it is born prematurely

Question 15

What is the significant developments that take place in the 8th month?

Answer 15

• Fatty tissue deposition gives fetus more babyish look
• Twins are born

Question 16

What is the significant developments that take place in the 9th month?

Answer 16

• More fat deposition occurs
• Lanugo is shed
• Nails extend to or beyond finger tips
• Birth is imminent