Fetal Development Timeline

  • Week 1

    Week 1
    In the first week of your pregnancy, there's no baby, but a growing fetus will be there very soon
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    Fetal Development Timeline

    Created by Hunter Tomczyk
  • Week 2

    Week 2
    There's no fetus inside but ovulation is occuring, which is the best time for one to be conceived. The egg is patiently waiting for a sperm to fertilize it.
  • Week 3

    Week 3
    Sperm finds the egg.
    Fertilization occurs and the baby begins to take form as a tiny group of cells.
    Appearance, sex, and even some of The baby's personality and intelligence are created during fertilization.
  • Week 4

    Week 4
    Blastocytes that will eventually be the baby splits and forms the placenta and the embryo. The specialized parts of the baby's body begin to develop.
  • Week 5

    Week 5
    Baby's heart and circulatory system begin to develop. hCG levels are high enough to show results on pregnancy tests.
    Baby is as big as a peppercorn.
  • Week 6

    Week 6
    Baby's face begins taking shape.
    Baby is about the size of a pomegranate seed
    Many women will experience peeing very frequently.
  • Week 7

    Week 7
    Baby's brain begins growing
    Baby is about the size of a blueberry
    Many women will experience tingly, achy breasts.
  • Week 8

    Week 8
    Baby begins moving around frequently in womb.Your Developing Baby. The baby is starting to develop fingers and toes and has some tiny facial features.
    Baby is about the size of cranberry bean
  • Week 9

    Week 9
    Baby begins to build muscle. Also the baby's head is about the same size of the rest of the body.
    Baby is about the size of a cherry
    Women may experience exhaustion
  • Week 10

    Week 10
    Baby begins building bones and cartilage. Fingers and toes are showing, and kidneys are producing urine.
    Baby is about the size of a kumquat
    Women need to increase fiber intake for pregnany constipation
  • Week 11

    Week 11
    Baby begins to resemble human being. The baby is also Inhaling amniotic fluid to help develop strong lungs.
    Baby is about the size of brussel sprout
  • Week 12

    Week 12
    Baby is flexing muscles and has reflexes inside and The baby can feel when you put your hand on your stomach
    Baby is about the size of a passion fruit
  • Week 13

    Week 13
    The baby's organs are done forming, and their eyes are moving toward the center of the face instead of the side. Baby can even suck on their thumb now.
    Baby is about the size of a lemon
  • Week 14

    Week 14
    Hair begins to grow on head,eyebrows, and body.
    Baby is about the size of a nectarine
    Mothers symptoms should begin easing up.
  • Week 15

    Week 15
    Baby begins kicking and flexing elbows although the mother might not feel it. The baby an also make facial features.
    Baby is about the size of an apple
  • Week 16

    Week 16
    Baby's eyesight begin to develop as well as the babys eyelashes. Umbilical cord is fully developed
    The baby is about the size of avocado
  • Week 17

    Week 17
    Baby begins practicing for sucking and swallowing in womb for preperation of feeding. Baby's sweat glands are developed as well
    Baby is about the size of pear
  • Week 18

    Week 18
    Baby's movement should be felt now as it moves around more. Baby's ears are now there but are very sensitive
    Baby is about the size of sweet potato
  • Week 19

    Week 19
    Baby's skin creates a protective coating
    Baby is about the size of mango
  • Week 20

    Week 20
    Baby's gender can be found through ultrasound. Baby is now kicking and flexing their muscles and testing out their reflexes.
    Baby is about the size of artichoke.
  • Week 21

    Week 21
    Baby begins "grazing" on whatever the mother eats. Baby's having a growth spurt from all the amniotic fluid they're swallowing
    Baby is about as long as a carrot
    Mother typically starts to show stretch marks
  • Week 22

    Week 22
    Baby's senses begin to develop especially the sense of touch
    Baby is about the size of papaya
    Some mothers may experience feet growth
  • Week 23

    Week 23
    Baby is becoming plumper or bigger as well as their brains and lungs.
    Baby is about the size of a eggplant
    Mothers may notice the linea nigra on her belly
  • Week 24

    Week 24
    Baby's facial features begin filling out and baby will respond to familiar voices
    Baby is about as long as a ear of corn
    Mothers belly buttons may be (really) popping out
  • Week 25

    Week 25
    Baby is preparing to take first breath. Baby also starts producing poop that won't be let out until after birth
    Baby is about the size of acorn squash
  • Week 26

    Week 26
    Baby's can distinguish night and day by quietness and baby can also distinguish partners voices.
    Baby is about as long as zucchini
    Mothers may experience restlessness
  • Week 27

    Week 27
    Baby moves on to a new growth chart and can now hiccup.
    Baby is about the size of a head of cauliflower
    Mothers feet and ankles may experience swelling
  • Week 28

    Week 28
    Baby begins to blink, gains eye pigment, and the baby will start dreaming
    Baby is about the size of a kabocha squash
  • Week 29

    Week 29
    Baby's weight increases rapidly also intelligence and personality become more apparent through brain
    Baby is about the size of a butternut squash
    Mothers varicose veins may begin to show
  • Week 30

    Week 30
    Baby's brain begins developing and becoming more advanced. The baby also from now until birth will gain about half a pound every week
    Baby is about the size of a large head of cabbage
    Women may experience heart burn
  • Week 31

    Week 31
    Baby's senses begin to increase and baby has grown so much it will remain in fetal position until birth
    Baby is about as long as a leek
    Mothers may experience shortness of breath from decreasing breathing room
  • Week 32

    Week 32
    Baby practices sucking and breathing as the lungs develop even more
    Baby is about the size of a Napa cabbage
    Mothers uterus may begin to have Braxton Hicks contractions
  • Week 33

    Week 33
    Baby's immune system gets a boost as the baby's development is slowing down
    Baby is about the size of a pineapple
  • Week 34

    Week 34
    If the baby is a boy his testicles descend and the vernix caseosa becomes thicker to prepare skin for big day
    Baby is about the size of a cantaloupe
    Mothers may experience less sharp vision
  • Week 35

    Week 35
    Baby's brain grows rapily making their head weigh more putting more pressure on the moms bladder. Baby's head is making its way upside down for birthing
    Baby is about the size of a honeydew melon
  • Week 36

    Week 36
    Baby's bones are almost if not fully developed and baby is creating extra fat
    Baby is about the size of a canary melon
    Mothers experience aching in their bones
  • Week 37

    Week 37
    Doctors usually begin checking for labor signs
    Baby begins preparations of birth by sucking, breathing, and turning in the womb. The umbilical cord starts sending antibodies to protect baby after birth
    Baby is about as long as a Swiss chard
  • Week 38

    Week 38
    Baby produces surfactant which will help it take its first breaths
    Baby is about as long as a rhubarb
    Mother produces colostum which is the precursor to breast milk
  • Week 39

    Week 39
    Baby's brain is still developing very quickly but has reached birth size
    Baby is about the size of a mini watermelon
    Mother may begin showing signs of labor
  • Week 40

    Week 40
    This is the official end of pregnancy.
    Only 3-5% are born exactly on their due date and some may be born earlier or later in the coming weeks. The baby may already be in this world or is soon to be in this world either way the mother should be congratulated for her 9 month journey
    Baby is about the size of a watermelon