Pregnancy and the Trimesters
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Transcript Pregnancy and the Trimesters
Conception
– 4 weeks
8
weeks
12 weeks
16
weeks
20 weeks
24 weeks
28
weeks
32 weeks
36 - 38 weeks
Less
1/10 inch long
Beginning of spinal cord, nervous system,
heart, intestinal system and lungs
Amniotic Sac – clear fluid, in which the
unborn baby floats and moves
Less
than 1 inch
Face forming – eyes, ears, mouth
Arms and legs are moving
Heartbeat detectable
3
inches and weighs 1 oz
Moving fingers and toes
Finger prints
Can smile, frown, swallow and urinate
5
½ inches long, 4 oz
Strong heartbeat
Thin skin
Downy hair over body
Fingernails and toe nails develop
10-12
inches
Sucks thumb
Hiccup
Hair, eyelashes and eyebrows
Rolls over fluid
11-14
inches 1 ½ lbs
Wrinkled skin
Open eyes
Strong grip
14-17
inches, 2 ½ - 3 lbs
Adding body fat
Very active
16
½ - 18 inches, 4 – 5 lbs
Sleep/awake
Responds to sounds
19 inches 6lbs
Skin less wrinkled
Gaining immunities from mother
Embryonic
Occurs 2-8 weeks after conception
Rate increases of cell division, support systems
for the cells form, organs appear
Germinal
Period
period
Takes place in first 2 weeks after conception
Creation of zygote (fertilized egg), cell division
attachment of the zygote to the uterine wall
Embryonic
Period
Occurs 2-8 weeks after conception
Rate increases of cell division, support systems for
the cells form, organs appear
The mass of cells attached to the uterine wall forms
three layers and is now called the embryo
Endoderm – inner layer of cells will develop into
digestive and respiratory systems
Ectoderm – outer layer of cells will become the
nervous systems and sensory receptors (ears, nose,
eyes and skin)
Mesoderm – middle layer – will develop into the
circulatory system, bones, muscle, excretory system
and reproductive system
Fetal
Period
2 months of conception
Last for 7 months
Development is very dramatic