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The 1st Trimester
Months 1 to 3
Includes the pre-embryo stage The first 14 days after conception Morula at 3 days -
The 1st Trimester the Pre-Embryo Stage
This stage includes the implantation at about 10 to 12 days -
The 1st Trimester - 1st Month
0.6 cm (3/16 in.)
-Bone formation starts.
-Vertebral column and vertebral canal form.
-Small buds that will develop into upper and lower extremities form.
-Heart forms and starts beating.
-Body systems begin to form.
-The central nervous system appears at the start of the third week -
The 1st Trimester1 1/2 Month
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The 1st Trimester - 2nd Month
3cm (l l/4in.)
l gram(l/30oz)
-Eyes far apart, eyelids fused, nose flat.
-Extremities become distinct and digits are well formed.
-Major blood vessels form.
-Many internal organs continue to develop. -
The 1st Trimester - 3rd Month
7.5cm(3 in.) 30g(1 oz.)
-Eyes almost fully developed but eyelids still fused, nose develops bridge, and external ears are present
-Bone formation continues.
-Extremities are fully formed and nails develop.
-Heartbeat can be detected. Urine starts to form.
-Fetus begins to move, but it cannot be felt by mother.
-Body systems continue to develop -
The 2nd Trimester - Months 4 to 6
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The 2nd Trimester - Month 4
18 cm (6 1/2 to 7 in.) 100 g (4 oz.)
-Head large in proportion to rest of body.
-Face takes on human features and hair appears onhead. Skin bright pink.
-Many bones ossified (harden), and joints begin to form.
-Rapid development of body systems. -
The 2nd Trimester - Month 5
25 to 30 cm (10 to 12 in.)
200 to 450 g(1/2 to 1 Ib)
-Head is less disproportionate to rest of body.
-Fine hair (lanugo) covers body. Skin still bright pink.
-Fetal movements commonly felt try mother (quickening).
-Rapid development of body systems. -
The 2nd Trimeste - 21 Week Medical Miracle
While undergoing spina bifida surgery in utero, 21-week-old fetus Samuel Armas reaches out of the incision in his mother's womb to grip the finger of Dr. Joseph Bruner. -
The 2nd Trimester - Month 6
27to35cm(lltol4in.)
550to800g(l 1/4 to 1 1/2 Ib)
-Head becomes even less disproportionate to rest of Body.
-Eyelids separate and eyelashes form.
-Substantial weight gain.
-Skin wrinkled and pink. -
The 3rd Trimester - Months 7 - 9
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The 3rd Trimester - Month 7
32 to 42 cm (13 to 17 in.)
1100 to 1350g(2 1/2 to 3 Ib)
-Fetus assumes an upside-down position.
-Testes descend into scrotum. -
The 3rd Trimester - Month 7
-Head and body more proportionate.
-Skin wrinkled and pink. **Seven-month fetus (premature baby) is capable of survival. -
The 3rd Trimester - Month 8
41 to 45 cm (16 1/2 to 18 in.)
2000 to 2300 g (4 1/2 to 5 Ib)
-Just under the skin fat is deposited (subcutaneous fat). Skin less wrinkled.
-Bones of head are soft.
-Chances of survival much greater. -
The 3rd Trimester - Month 9
50 cm (20 in.)
3200 to 3400 g (7 to 7 1/2 Ib)
-Additional subcutaneous fat accumulates.
Lanugo shed.
-Nails extend to tips of fingers and maybe even beyond.
-Results in birth. -
Warning Signs During Pregnancy
Unusually heavy or smelly vaginal discharge.
%u2022Very bad headaches, dizziness or blurred vision, persistent fatigue, or trouble breathing.
%u2022Bleeding from the vagina.
%u2022Swollen hands and face (especially in late second or third trimester).
%u2022No signs of labor more than one day after membranes rupture (%u201Cwater breaks%u201D).
%u2022Seizures or blackouts.
%u2022Marked decrease in urine output.
%u2022Severe, unexplained pain in the shoulder.
