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Week 1-2
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Week 3-4
-Conception
- Zygote turn into Biastocyst and travels down the Fallopian tube
- Rapid cell division begins
- Blastocyst implants in Uterus living during week 4 and becomes an embryo. -
Weeks 5-6
-neural tubes close; brain and spinal cord will form
-heart, organs, and bones start to form
-develop head and trunk
-arm and leg limb buds appear
-brain begins development
-eyes and ears begin to form
-heart continues to develop, and beats a regular rhythm
- baby is 1/6 inch long -
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Week 7-8
- brain and face shape begin growing
- four-chamber heart
- lungs begin to form
- fingers and toes start to form
- ears begins to develop internally
- lips and nose have formed
- trunk and neck to straighten
- baby is about 1/2 inches long
- all major organs bare formed
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Week 10
- head is half the size of the baby
- all body parts are present
- eyes, ears, arms, and legs are identifiable
- baby is 1 1/4 inches long
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Week 11
- genitals develop
- head is about half of the length of baby
- teeth buds form
- baby is about 2 inches in length and weighs about 1/3 ounce
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Week 12
- fingernails grow
- face has more defined profile
- intestines are in the abdomen
- about 2 1/2 inches in length and weighs about 1/2 ounce
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Week 14
- baby's sex will become apparent
- baby can swallow and make urine
- baby is about 3 1/2 inches in length and weighs about 1 1/2 ounces
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Week 16
- baby is moving but mom cannot feel it
- baby is about 4 1/2 inches in length and weighs about 4 ounces
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Week 18-19
- baby begins to hear
- digestive system works
- vernix caseosa cover the baby
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Weeks 20-21
- regular sleep and wake patterns
- all organs and structures formed
- breathing movement occur but are underdeveloped
- covered lanugo
- may begin to suck thump
- baby is about 6 1/3 inches in length and weighs about 11 ounces
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Week 22
- Has nails, fingerprints, eyebrows, lashes, and possibly some hair
- more active
- heart beat heard with stethoscope
- lowest limit of viability (survival outside the mother)
- baby is about 7 1/2 inches in length and weighs about 1 pound
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Week 24
- wrinkly skin, and pinkish red
- lung development
- regular sleep and wake pattern
- baby is about 8 inches in length and weighs about 1 1/3 pounds
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Weeks 31-32
- finished most major development
- rapid weight gain begins
- baby is 11 inches and 3 3/4 pounds
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Weeks 28-29
- eyes will begin to open/close central nervous system directs breathing and body temperature control
- lungs are capable of breathing air
- baby begins to kick and stretch
- baby in length is 10 inches and is 2 1/4 pounds
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Week 34
- continues to grow fingernails and toenails
- develop breathing motion responds to light
- skin is pink and smooth
- baby is 12 inches (length) and weighs 4 1/2 pounds
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Weeks 36-37
- takes up most of amniotic sac
- starts to turn head down to prepare for labor
- baby is 13 1/2 inches in length and weighs 6 pounds
- will gain 1/2 pounds a week until delivery
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Weeks 38-40
- brain, lungs, and liver still developing
- brain will double in size between week 35 and 39
- lung development continues after birth
- baby is considered full term
- weight gain helps body temperature