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Weeks 1-4
1st trimester begins.
The egg is fertilized, and becomes what is known as an embyro.
This embryo starts to rapidly replicate and build up cells. -
Period: to
Weeks 1-4
1st trimester begins.
The egg is fertilized, and becomes what is known as an embyro.
This embryo starts to rapidly replicate and build up cells. -
Week 3
Embryo is about half an inch long.
Nervous system, which includes the spinal cord and the brain start to form. -
End of Week 4
Heart is beating.
Lungs, face, hands, arms and legs are starting to form, slowly but surely. -
Weeks 4-8
Estrogen is increased by 1000x. -
Period: to
Weeks 4-8
Test -
Week 7
Brain is developing very rapidly.
Limbs are taking form.
Eyes become colored, and eyelids start to form.
The head is about as large as the rest of the body. -
Period: to
Weeks 9-12
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Week 10
Embryo is now called a fetus at this stage.
Mother's heart starts to pump hard.
Bones grow and stiffen, and fingerprints start to form. -
Week 11
All organs are working, yet premature.
Fetus is active, moves around a lot.
Phalanges are forming. -
Period: to
Weeks 13-16
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Week 14
Fingernails start to form.
Umbilical cord grows to support the growing fetus.
Air passages are being developed, but are not in use, as there is no air in the womb. -
Period: to
Weeks 17-20
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Week 18
Eyelashes start to form, along with eybrows and on the scalp.
Lungs start to recieve blood.
Vernix Caseosa protects the baby from constant contact with fluids. -
Week 21
Fetus is very active, and practices motor skills often.
The fetus can now hear sounds outside the womb.
Organs are maturing.
Fetus starts to develop fat stores.
8-12 inches long. -
Period: to
Weeks 21-24
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Weeks 25-36
Fetus starts to grow even more rapidly in size, weight, and length.
Fetus has less room to move.
Fetus starts to move into birthing position.
Lungs can now support the baby outside of the womb. -
Period: to
Weeks 25-36
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Birth
Baby is delivered! If no complications arose, then you now have a healthy baby.
