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Pregnancy Weekly

Pregnancy Week by Week: A Comprehensive Guide to Your Journey

Pregnancy is an extraordinary journey that brings forth a myriad of physical, emotional, and hormonal changes. To navigate this transformative experience, it’s essential to understand the week-by-week developments of your pregnancy. This comprehensive guide will provide you with a detailed account of what to expect during each week of your pregnancy.

Week 1: Conception

Pregnancy officially begins when a sperm fertilizes an egg. However, at this early stage, it’s not yet detectable by a pregnancy test. The fertilized egg, now called a zygote, travels through the fallopian tube and implants itself in the lining of the uterus.

Week 2: Implantation

The zygote continues to divide and grow, forming a hollow ball of cells called a blastocyst. The blastocyst attaches to the uterine lining, a process known as implantation. This triggers the production of human chorionic gonadotropin (hCG), the hormone detected by pregnancy tests.

Week 3: Embryonic Development

The blastocyst differentiates into two layers: the inner cell mass and the trophoblast. The inner cell mass will eventually develop into the embryo, while the trophoblast forms the placenta. The placenta is responsible for providing nutrients and oxygen to the growing embryo.

Week 4: Heartbeat Detected

The embryo’s heart begins to beat at around 22 days of gestation. This is a significant milestone in pregnancy and can be detected by an ultrasound. The embryo also starts to develop its brain, spinal cord, and other vital organs.

Week 5: Morning Sickness

Morning sickness, a common symptom of pregnancy, usually begins around this time. It’s caused by hormonal changes and can range from mild nausea to severe vomiting. Most women experience morning sickness during the first trimester, but it can persist throughout the pregnancy.

Week 6: Fetal Growth

The embryo continues to grow rapidly and is now referred to as a fetus. The facial features begin to develop, and the limbs and digits become more distinct. The fetus is also starting to move, although these movements are not yet noticeable to the mother.

Week 7: Ultrasound Confirmation

A transvaginal ultrasound can now confirm the pregnancy and provide a clear view of the fetus. The ultrasound can also detect any potential complications or abnormalities.

Week 8: Risk of Miscarriage Decreases

The risk of miscarriage decreases significantly after the first trimester. The fetus is now fully formed and protected by the amniotic sac and placenta.

Week 9: Baby Bump

For some women, the baby bump may start to become visible around this time. The uterus is expanding to accommodate the growing fetus.

Week 10: Fetal Movement

The fetus is now actively moving, and some women may start to feel these movements, known as quickening.

Week 11: Gender Determination

If you opt for prenatal testing, you can determine the gender of your baby through an ultrasound or blood test.

Week 12: End of First Trimester

The first trimester ends with the completion of week 12. By this time, the fetus is fully formed and has all its major organs.

Week 13: Second Trimester Begins

The second trimester is generally considered the most comfortable phase of pregnancy. Morning sickness usually subsides, and the baby bump becomes more noticeable.

Week 14: Fetal Growth Spurt

The fetus experiences a growth spurt during this week, and its movements become stronger. The mother may also start to feel Braxton Hicks contractions, which are practice contractions that prepare the body for labor.

Week 15: Baby’s Heartbeat Audible

The baby’s heartbeat can now be heard with a stethoscope. The fetus is also starting to produce its own urine and feces.

Week 16: Fetal Hiccups

The fetus may start to have hiccups, which can be felt by the mother as rhythmic movements.

Week 17: Baby’s Eyes Open

The baby’s eyes begin to open and can sense light. The fetus is also starting to develop its own unique personality.

Week 18: Baby’s Sex Organs Develop

The baby’s sex organs continue to develop, and the external genitalia become more distinct.

Week 19: Baby’s Movements Increase

The baby’s movements become more frequent and stronger. The mother may also start to notice the baby’s sleep-wake patterns.

Week 20: Ultrasound to Check Fetal Growth

An ultrasound is typically performed around this time to check the baby’s growth and development.

Week 21: Baby’s Hearing Develops

The baby’s hearing is fully developed, and it can hear sounds from outside the womb.

Week 22: Baby’s Hair Grows

The baby’s hair starts to grow, and its skin becomes thicker.

Week 23: Baby’s Lungs Develop

The baby’s lungs continue to develop, and it begins to practice breathing.

Week 24: Baby’s Taste Buds Develop

The baby’s taste buds develop, and it can taste the flavors of the amniotic fluid.

Week 25: Baby’s Weight Gain

The baby starts to gain weight rapidly, and its movements become even stronger.

Week 26: Baby’s Eyesight Develops

The baby’s eyesight continues to develop, and it can now focus on objects.

Week 27: Baby’s Brain Activity Increases

The baby’s brain activity increases significantly, and it begins to learn and remember.

Week 28: Baby’s Immune System Develops

The baby’s immune system starts to develop, and it can now fight off infections.

Week 29: Baby’s Skin Changes

The baby’s skin becomes less wrinkled and more plump.

Week 30: Baby’s Position

The baby’s position in the uterus becomes more stable, and it may start to descend into the pelvis.

Week 31: Baby’s Fat Layer Develops

The baby’s body starts to develop a layer of fat, which helps regulate its temperature.

Week 32: Baby’s Toenails Grow

The baby’s toenails start to grow.

Week 33: Baby’s Lungs Mature

The baby’s lungs continue to mature, and it is now capable of breathing on its own.

Week 34: Baby’s Head Circumference Increases

The baby’s head circumference increases rapidly, and its hair becomes thicker.

Week 35: Baby’s Movements Slow Down

The baby’s movements may slow down as it runs out of space in the uterus.

Week 36: Baby’s Position Changes

The baby may change its position to head-down in preparation for birth.

Week 37: Baby’s Skin Changes

The baby’s skin becomes smoother and less wrinkled.

Week 38: Baby’s Weight Stabilizes

The baby’s weight stabilizes, and it is now considered full-term.

Week 39: Baby’s Position

The baby is usually in a head-down position, ready for birth.

Week 40: Due Date

The due date is the estimated date of birth. However, only about 5% of babies are born on their due date.

Week 41+: Post-Term Pregnancy

If the baby is not born by week 41, it is considered post-term. Your doctor may recommend inducing labor to prevent complications.


Pregnancy is a remarkable journey that involves a multitude of physical, emotional, and hormonal changes. Understanding the week-by-week developments of your pregnancy can help you navigate this transformative experience with confidence and joy. Remember to consult with your healthcare provider throughout your pregnancy to ensure the health and well-being of both you and your baby.

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