**Week 1**
* You may not even know you’re pregnant yet, but your body has already started changing. Your uterus is beginning to grow and your breasts may be tender or sore.
* Your baby is just a tiny embryo, about the size of a poppy seed.
**Week 2**
* The embryo implants in your uterus. This can cause some light bleeding or spotting.
* Your baby’s heart starts to beat.
**Week 3**
* The embryo grows rapidly and begins to develop major organs.
* You may start to experience morning sickness.
**Week 4**
* Your baby is now a fetus and is about the size of a lentil.
* The fetus’s arms and legs begin to develop.
**Week 5**
* The fetus’s facial features begin to form.
* You may start to show a baby bump.
**Week 6**
* The fetus’s heart is fully formed.
* The fetus’s eyelids and ears begin to develop.
**Week 7**
* The fetus’s fingers and toes begin to develop.
* You may start to feel your baby move.
**Week 8**
* The fetus is about the size of a raspberry.
* The fetus’s bones begin to harden.
**Week 9**
* The fetus’s genitals begin to develop.
* You may start to feel your baby’s kicks.
**Week 10**
* The fetus is about the size of a strawberry.
* The fetus’s nails begin to grow.
**Week 11**
* The fetus’s kidneys begin to function.
* You may start to feel your baby’s hiccups.
**Week 12**
* The fetus is about the size of a lime.
* The fetus’s hair begins to grow.
**Week 13**
* The fetus’s eyelids open.
* The fetus’s vocal cords begin to develop.
**Week 14**
* The fetus is about the size of an avocado.
* The fetus’s movements become more coordinated.
**Week 15**
* The fetus’s skin begins to thicken.
* The fetus’s eyebrows and eyelashes begin to grow.
**Week 16**
* The fetus is about the size of a pear.
* The fetus’s sex can be determined by ultrasound.
**Week 17**
* The fetus’s lungs begin to mature.
* The fetus’s heartbeat can be heard with a stethoscope.
**Week 18**
* The fetus is about the size of a bell pepper.
* The fetus’s brain is rapidly developing.
**Week 19**
* The fetus’s eyes begin to open and close.
* The fetus’s movements become stronger.
**Week 20**
* The fetus is about the size of a banana.
* The fetus’s skin is covered with a fine hair called lanugo.
**Week 21**
* The fetus’s ears are fully formed.
* The fetus’s reflexes begin to develop.
**Week 22**
* The fetus is about the size of a coconut.
* The fetus’s fingernails and toenails begin to grow.
**Week 23**
* The fetus’s skin begins to wrinkle.
* The fetus’s hearing is fully developed.
**Week 24**
* The fetus is about the size of a cantaloupe.
* The fetus’s lungs are almost fully developed.
**Week 25**
* The fetus’s eyes are open and can focus.
* The fetus’s hair begins to grow darker.
**Week 26**
* The fetus is about the size of a cabbage.
* The fetus’s body fat begins to increase.
**Week 27**
* The fetus’s eyelids begin to flutter.
* The fetus’s reflexes are fully developed.
**Week 28**
* The fetus is about the size of an eggplant.
* The fetus’s skin begins to smooth out.
**Week 29**
* The fetus’s nails are fully grown.
* The fetus’s movements become more frequent.
**Week 30**
* The fetus is about the size of a honeydew melon.
* The fetus’s lungs are fully mature.
**Week 31**
* The fetus’s head is engaged in the pelvis.
* The fetus’s movements become more coordinated.
**Week 32**
* The fetus is about the size of a pineapple.
* The fetus’s skin is covered with a waxy substance called vernix caseosa.
**Week 33**
* The fetus’s lungs are fully developed.
* The fetus’s movements become more frequent and stronger.
**Week 34**
* The fetus is about the size of a papaya.
* The fetus’s head is fully developed.
**Week 35**
* The fetus’s skin is smooth and pink.
* The fetus’s hair is fully grown.
**Week 36**
* The fetus is about the size of a watermelon.
* The fetus’s lungs are fully mature.
**Week 37**
* The fetus’s head is engaged in the pelvis.
* The fetus’s movements become more frequent and stronger.
**Week 38**
* The fetus is about the size of a honeydew melon.
* The fetus’s lungs are fully mature.
**Week 39**
* The fetus’s head is fully engaged in the pelvis.
* The fetus’s movements become more frequent and stronger.
**Week 40**
* The fetus is about the size of a pineapple.
* The fetus’s lungs are fully mature.
**Congratulations! You’re now the proud parent of a beautiful baby.**.
