Development Timeline

By oziel22
  • 1 CE

    Week 1

    Your tiny embryo is growing like crazy, and you may be noticing pregnancy discomforts like sore breasts and fatigue.
  • week 2
    2

    week 2

    It's a potentially life-changing week. You'll ovulate, and if egg meets sperm, you'll be on your way to pregnancy!
  • week 3
    3

    week 3

    Your baby is a tiny ball – called a blastocyst – made up of several hundred cells that are multiplying quickly.
  • week 4
    4

    week 4

    Deep in your uterus, your baby is an embryo made up of two layers, and your primitive placenta is developing.
  • week 5
    5

    week 5

    Your tiny embryo is growing like crazy, and you may be noticing pregnancy discomforts like sore breasts and fatigue.
  • week 6
    6

    week 6

    Your baby's nose, mouth, and ears are beginning to take shape. You may be having morning sickness and spotting.
  • week 7
    7

    week 7

    Your baby – still an embryo with a small tail – is forming hands and feet. Your uterus has doubled in size.
  • week 8
    8

    week 8

    Your baby is constantly moving, though you can't feel it. Meanwhile, you may be making decisions about prenatal tests.
  • week 9
    9

    week 9

    Nearly an inch long now, your baby is starting to look more human. You've probably noticed your waist thickening.
  • week 10
    10

    week 10

    Your baby has finished the most critical part of development! Organs and structures are in place and ready to grow.
  • week 11
    11

    week 11

    Your baby's hands will soon open and close into fists, and tiny tooth buds are appearing underneath the gums.
  • week 12
    12

    week 12

    Your little one's teeny toes can curl, her brain is growing furiously, and her kidneys are starting to excrete urine.
  • week 13
    13

    week 13

    It's the last week of the first trimester! Your baby now has exquisite fingerprints and is almost 3 inches long.
  • week 14
    14

    week 14

    Your baby's tiny features are making different expressions. And you may be feeling more energetic and less nauseated.
  • week 15
    15

    week 15

    Your baby can sense light and is forming taste buds. Have a stuffy nose? It's a surprising pregnancy side effect.
  • week 16
    16

    week 16

    Get ready for a growth spurt. In the next few weeks, your baby will double his weight and add inches to his length.
  • week 17
    17

    week 17

    Your baby's skeleton is changing from soft cartilage to bone, and the umbilical cord is growing stronger and thicker.
  • week 18
    18

    week 18

    Your baby's genitals are developed enough to see on an ultrasound. Hungry? An increase in appetite is normal now.
  • week 19
    19

    week 19

    Go ahead and sing: Your baby may be able to hear you! And if your sides are aching, it could be round ligament pain.
  • week 20
    20

    week 20

    Congratulations, you're at the halfway mark in your pregnancy! Your baby is swallowing more now and producing meconium.
  • week 21
    21

    week 21

    Feeling your baby move? Those early flutters will turn into full-fledged kicks. Cool fact: She has eyebrows now
  • week 22
    22

    week 22

    Your baby is starting to look like a miniature newborn. And your growing belly may be turning into a hand-magnet.
  • week 23
    23

    week 23

    When you're on the move, your baby can feel the motion. Pretty soon, you may notice swelling in your ankles and feet.
  • week 24
    24

    week 24

    Your baby is long and lean, like an ear of corn. And your growing uterus is now the size of a soccer ball.
  • week 25
    25

    week 25

    Your little one is starting to add some baby fat and grow more hair. Your hair may be looking extra lustrous, too.
  • week 26
    26

    week 26

    Your baby is inhaling and exhaling small amounts of amniotic fluid, which is good practice for breathing.
  • week 27
    27

    week 27

    Feel a tickle? It may be your baby hiccupping. He's also opening and closing his eyes and even sucking his fingers.
  • week 28
    28

    week 28

    Welcome to your last trimester! Your developing baby's eyes may be able to see light filtering in through your womb.
  • week 29
    29

    week 29

    Your baby's muscles and lungs are continuing to mature, and her head is growing to make room for her developing brain.
  • week 30
    30

    week 30

    Your baby now weighs almost 3 pounds. Meanwhile, you may be battling mood swings, clumsiness, and fatigue.
  • week 31
    31

    week 31

    Your baby's strong kicks might be keeping you up at night – and you may be feeling Braxton Hicks contractions, too.
  • week 32
    32

    week 32

    Your baby is plumping up! Meanwhile, your expanding uterus may cause heartburn and shortness of breath.
  • week 33
    33

    week 33

    With your baby now weighing a little over 4 pounds, you might be waddling – and having trouble getting comfy in bed.
  • week 34
    34

    week 34

    Your baby's central nervous system and lungs are maturing, and dizziness and fatigue may be slowing you down.
  • week 35
    35

    week 35

    Your baby is too snug in your womb to do any type of movements.
  • week 36
    36

    week 36

    Your baby is gaining about an ounce a day. You may feel her "drop" down into your pelvis as you approach your due date.
  • week 37
    37

    week 37

    Your baby's brain and lungs are continuing to mature. You may have more vaginal discharge and occasional contractions.
  • week 38
    38

    week 38

    Your baby has a firm grasp, which you'll soon be able to test in person! Meanwhile, watch out for signs of preeclampsia.