Fetus Development

  • Week 1

    Week 1

    Your body begins to prepare for pregnancy, common side effects are: cramps, fatigue, and being or feeling bloated.
  • Week 2

    Week 2

    Ovulation starts, which allows your egg to fertilize. It begins to form the baby human.
  • Week 3

    Week 3

    Implantation process occurs, your body stops releasing eggs, and your fertilized egg settles.
  • Week 4

    Week 4

    The ball of cells becomes an embryo, you could get a positive result on a pregnancy test.
  • Week 20

    Week 20

    Baby is able to swallow, digestive system is producing a dark, sticky, goo that will pass in the first poop.
  • Week 5

    Week 5

    Circulatory system begins to form. Your baby is growing fast and it resembles a tadpole.
  • Week 6

    Week 6

    Baby is the size of a pomegranate seed. The nose, mouth, ears, brain, and intestines begin to develop.
  • Week 7

    Week 7

    Your baby doubles in size from the past week. It has a tail that will soon disappear.
  • Week 8

    Week 8

    Nerve cells branch out and form primitive neural pathways. Baby starts moving, but you won’t feel it.
  • Week 9

    Week 9

    Baby has tiny earlobes. Embryonic tail has disappeared. They basic physiology is in place.
  • Week 10

    Week 10

    Baby has completes the most critical position of development. It’s limbs can bend, however baby still has translucent skin.
  • Week 11

    Week 11

    Baby is almost fully formed, but still tiny. Since the diaphragm is developing baby is experiencing hiccuping. Mom doesn’t feel it nor the stretching or kicking that the baby begins to do.
  • Week 12

    Week 12

    Fingers will soon be able to open and close. Baby’s reflexes begin to kick in.
  • Week 13

    Week 13

    Last week of the first trimester. Baby has tiny fingers with formed fingerprints. It’s veins and organs are now visible.
  • Week 14

    Week 14

    Starts using facial muscles; brain impulses begin to fire. Kidneys are now functioning.
  • Week 15

    Week 15

    Baby’s eyelids are closed shut but is able to sense it because of it’s sensitivity.
  • Week 16

    Week 16

    Legs are more developed. The scalp pattern is formed but the hair is not yet visible.
  • Week 17

    Week 17

    Baby’s skeleton is hardening to bone, able to move joints, the umbilical cord is growing strong.
  • Week 18

    Week 18

    Baby flexes arms and legs, mom can feel movements internally.
  • Week 19

    Week 19

    Baby’s sense begin to develop smell, vision, touch, taste, and hearing. Baby may be able to hear mom’s voice.
  • Week 21

    Week 21

    Baby’s kicks change from flutters to actual kicks and jabs against the wall of your womb.
  • Week 22

    Week 22

    Baby’s lips and brows are more distinct. The whole baby looks like a tiny newborn.
  • Week 23

    Week 23

    Baby’s ear are functioning and may be able to recognize sounds once they are out of the womb.
  • Week 24

    Week 24

    Baby’s skin is thin and translucent. Baby seems long and lean but will soon become chubbier.
  • Week 25

    Week 25

    Baby’s wrinkled skin is filled up with the baby’s fat. Hair is coming out.
  • Week 26

    Week 26

    Baby is inhaling and exhaling amniotic fluid which helps develop it’s lungs.
  • Week 27

    Week 27

    Last week of the second trimester, it sleeps and wakes on a regular schedule. Brain is active.
  • Week 28

    Week 28

    Baby’s eyesight is developing, it’s able to blink and sense light. Lashes are growing.
  • Week 29

    Week 29

    Baby’s muscles and lungs are preparing to begin to function for when they are born.
  • Week 30

    Week 30

    Baby is surrounded by a pint and a half of amniotic fluid. Soon there will be less of it as the baby grows.
  • Week 31

    Week 31

    Baby can turn it’s head from side to side. A protective layer of fat is forming under the skin.
  • Week 32

    Week 32

    Mom is gaining around a pound each week. Part of that weight gain is for the baby.
  • Week 33

    Week 33

    Baby's skull bones aren't fused yet. It helps when they go through the birth canal because they shift.
  • Week 34

    Week 34

    Baby's lungs and central nervous system are maturing.
  • Week 35

    Week 35

    Baby's liver is beginning to work, kidneys are fully developed, and baby is feeling snug in the womb.
  • Week 36

    Week 36

    Baby starts to gain an ounce a day.
  • Week 37

    Week 37

    Due date is very close, baby may seem like a new born already, but is not developed enough or ready enough to be born.
  • Week 38

    Week 38

    Baby's eye color are not fully pigmented, so although they make look blue or green when she or he is born they will more likely change as they grow.