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None
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Conception
Zygote turns into blastocysts and travels down fallopian tube
Rapid cell division
Blastocyst implants in uterus lining during week 4 becomes embryo -
Neural tube closes
Brian spine and heart organs and bones begin to form
Arm and limb buds appear
Brain begins development
Eyes and ears form
Heart beats and develops
Baby is 1/6 inches long -
Brain and face shape grows
Four chamber heart
Wings begin to form
Ear begins to develop
Lip and nose formed
Baby is 1/2 inches long
All major organs are formed -
Head is half the size of the baby
All body parts are present
Eyes and arms and legs are identifiable
Body is 1 1/4 inches long -
Genitals develop
Head is about half of the body
Teeth buds form
Baby is about 2 inches in length and weighs about 1/3 ounces -
Fingernails grow
Face has defined profile
Intestines are in the abdomen
About 2 1/2 inches in length and weighs 1/2 ounces -
Baby can swallow and make urine
Baby is about 3 1/2 inches and weighs about 1 1/2 ounces -
Baby is moving but mom cannot feel it
Baby is about 4 1/2 inches in length and weighs about 4 ounces -
Baby begins to hear
Digestive system works
Venix caseosa covers the body -
Regular sleep and wake patterns
All organs are formed
Breathing movements occur but are undeveloped
Covered in lanugo
Many begin to suck thumb
Baby is about 6 1/3 inches in length and weighs about 11 ounces -
Has nails fingerprints eyebrows and possibly some hair
More active
Heartbeat heard through a stethoscope
Lowest limit of viability
Baby is about 7 1/2 inches in length and weighs about 1 pound -
Wrinkly skin, translucent and pinkish red
Lung development
Regular sleep and wake pattern
Baby is about 8 inches and weighs about 1 1/3 pounds -
Stretch and kick
Eyes begin to open and close
Central nervous system directs breathing
Lungs capable of breathing air -
Finished most major development
Rapid weight gain begins
Lanugo starts to fall off
Baby is about 11 inches in length and weighs about 3 3/4 pounds -
Continues to grow fingernails and toenails
Develop breathing motion
Responds to light
Skin is pink and smooth
Baby is about 12 inches in length and weighs about 4 1/2 pounds -
Takes up most the amniotic sac
Starts to prepare for labor and turns head down
Baby is about 13 1/2 inches and weighs about 6 pounds
Will continue to grow 1/2 a pound a week until delivery -
Brain lungs and liver develop
Brain will double in size
Lung development
At week 39 the baby is full term
Will gain weight to help control temperature when born