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Week 1-2
No development -
Period: to
Weeks 3-4
The egg is now in the stage of conception.
The zygote turns into a blastocyst and travels down the fallopian tube.
It starts to begin rapid cell division.
The blastocyst implants in the uterus lining during week 4 and becomes an embryo. -
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Weeks 5-6
The neural tube closes and the brain and spinal will begin to form. Heart, organs, bones, eyes, and ears also start to form. Arm and leg buds develop.
Baby is 1/6 inch long. -
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Weeks 7-8
Brain and face shape begin growing.
Has a four-chamber heart.
Lungs, fingers, and toes begin to form. Ears develop internally. Lips, nose, and all major organs are formed.
Baby is 1/2 inch long -
Week 10
The baby's head is half the size of the baby.
All the body parts are present.
The eyes, ears, arms, and legs are identifiable.
The baby is 1 1/4 inch long -
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week 11
The baby's genitals develop.
The head is about half of the length of the baby and the teeth buds are forming.
Baby is about 2 inches in length and weighs 1/3 ounce. -
Week 12
Finger nails grow.
The face has a more defined profile.
The intestines are in the abdomen.
The baby is 2 1/2 inches in length and weighs about 1/2 ounch -
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2ND TRIMESTER- Week 14
The baby's gender becomes apparent.
The baby can now swallow and make urine.
The baby's head is becoming more round and forming with the rest of the body
The baby is about 3 1/2 inches in length and weighs 1 1/2 ounces. -
Week 16
The baby is moving but the mom cannot feel it.
The baby is the size of an apple, 4 1/2 inches.
Has a soft layer of hair.
Weighs about 4 ounces. -
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Week 18-19
The baby is able to hear.
The digestive system works and vernix caseosa covers the baby. The baby is about 5 inches. -
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Weeks 20-21
The baby has a regular sleep and wake pattern.
All organs and structures are formed and breathing movements occur but are underdeveloped.
Covered in lanugo.
The baby may suck thumb.
Baby is 6 1/3 inches inlength and weighs 11 ounces. -
Week 22
The baby has fingernails, eyebrows, eyelashes, and possibly some hair.
The baby is more active and the heartbeat can be heard with a stethoscope.
The baby could possibly survive outside the mother.
Baby is 7 1/2 inches and weighs a pound -
Week 24
The baby now has wrinkly skin, translucent and pinkish red skin. Lung developmet has happened.
Continues to have regular sleep and wake patterns.
Baby is 8 inches in length and weight is about 1 1/3 pounds -
Weeks 28-29
Eyes begin to partially open and close
The central nervous system directs breathing and body temperature control.
Lungs are capable of breathing air
Baby begins to kick and stretch
Baby is 10 inches and 2 1/2 pounds -
Weeks 31-32
Most major development is finished
Rapid weight gain begins
Lanugo starts to fall off the skin
Baby is 11 inches and 3 3/4 pounds -
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Week 34
The baby's finger and toe nails continue to grow
Breathing motion has developed
The baby responds to light
Skin is pink and smooth
Baby is 12 inches and 4 1/2 pounds -
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Weeks 36-37
The baby now takes up most of the amniotic sac.
The baby will begin to turn head down to prepare for labour.
The baby is 13 1/2 inches and 6 pounds.
Every week since week 37 the baby will gain 1/2 a pound. -
Weeks 38-40
The brain, lungs, and liver are still developing.
The brain will be doubled in size between week 35-39.
Lung development during the last few weeks help with fewer complications
At week 39, baby is full term.