-
Period: to
weeks 1-2
none -
Period: to
weeks 3-4
-conception
-zygote turns into blastocyst and travels down fallopian tubes
-rapid cell division
-blastocyst implants in uterus lining -
Period: to
weeks 5-6
-brain and spinal cord start to form
-heart, organs and bones develop
-develop head and trunk
-arms and legs form
-brain starts to develop
-ears and eyes form
-heart develops and starts to beat
-baby is 16 inches long -
Period: to
weeks 7-8
-brain and face shape continue developing
-4 chamber heart
-lungs begin to form
-fingers and toes begin to form
-ears develop
-lip and nose form
-trunk and neck begin to straighten
-baby in 1/2 inch long
-major organs have formed -
week 10
-head is half the size of the baby
-all body parts are present
-ears, eyes, arms and legs are identifiable
-baby is 1 1/6 inches long -
week 11
-genitals develop
-head is half the length of the baby
-teeth buds form
-baby is 2 inches in length
-baby weighs 1/3 ounce -
week 12
-fingernails grow
-face has defined
-intestines in the abdomen
-2 1/2 inches long
-weighs 1/2 ounce -
week 14
-sex will be determined
-can swallow and produce urine
-3 1/2 inches long
-weights 1 1/2 ounces -
week 16
-baby is moving but mom cannot feel it
-4 1/2 inches long
-weighs about 4 ounce -
Period: to
weeks 18-19
-baby begins to hear
-digestive system works
-vernix caseosa covers baby -
Period: to
weeks 20-21
-regular sleep and wake patterns
-all organs and structures formed
-breathing movements occur but are under-developed
-covered in lanugo
-baby may begin to suck thumb
-6 1/3 inches long
-weighs about 11 ounces -
week 22
-has nails, fingerprints, eyebrows, lashes and possibly hair
-more active
-heartbeat with stethiscope
-lowest limit of viability (survival outside the mother)
-7 1/2 inches long
-weighs 1 pound -
week 24
-wrinkly, translucent and pinkish, red skin
-lung development
-regular sleep and wake patterns
-8 inches long
-1 1/3 pounds -
Period: to
weeks 28-29
-eyes begin to parcially open and close
-nervous system directs breathing and body temp
-lungs breathing air
-begins to kick and stretch
-10 inches long
weighs 2 1/4 pounds -
Period: to
weeks 31-32
-finished major development
-rapid weight gain
-lanugo starts to fall off
-11 inches long
- 3 3/4 pounds -
week 34
-continues to grow fingernails
-develop breathing motion
-responds to light
-skin in pink and smooth
-12 inches long
-4 1/2 pounds -
Period: to
weeks 36-37
-takes up most of the amniotic sac
-starts to turn body for labor
-13 1/2 inches long
-weighs 6 pounds
-will continue to gain another 1/2 pound -
Period: to
weeks 38-40
-brain, lungs and liver are still developing
-brain will double in size between weeks 35 and 39
-lung development will help with less breathing complications during birth
-week 39 is considered full term
-weight gain helps with temp control during birth