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Week Of Pregnancy

Week of Pregnancy: A Comprehensive Guide

Pregnancy is a remarkable journey that encompasses a multitude of physical, emotional, and hormonal changes. Each week brings about new developments and milestones as the tiny embryo grows and transforms into a fully formed baby. This comprehensive guide will delve into the week-by-week progression of pregnancy, providing an in-depth understanding of the changes occurring within the mother’s body and the developing fetus.

Week 1: Conception

The first week of pregnancy is marked by the fertilization of an egg by a sperm, which occurs in the fallopian tube. The fertilized egg, now known as a zygote, begins its journey towards the uterus.

Week 2: Implantation

During the second week, the zygote undergoes rapid cell division and develops into a blastocyst. The blastocyst implants into the lining of the uterus, a process known as implantation.

Week 3: Embryonic Development

The third week witnesses the formation of the embryonic disc, which will eventually give rise to all the tissues and organs of the baby. The neural tube, which will develop into the brain and spinal cord, also begins to form.

Week 4: Heartbeat and Limb Formation

In the fourth week, the embryo’s heart begins to beat, and the limbs start to develop as small buds. The placenta, a vital organ that facilitates the exchange of nutrients and oxygen between the mother and the baby, also begins to form.

Week 5: Facial Features and Organ Development

During the fifth week, the embryo’s facial features begin to take shape, and the major organs, including the lungs, liver, and kidneys, start to develop.

Week 6: Fetal Movement and Gender Determination

In the sixth week, the embryo begins to make small movements, although the mother cannot yet feel them. The external genitalia begin to develop, allowing for the potential determination of the baby’s gender.

Week 7: Rapid Growth and Brain Development

The seventh week is characterized by rapid growth of the fetus, and the brain undergoes significant development. The fetus’s limbs become more defined, and the fingers and toes start to form.

Week 8: Fetal Heartbeat Audible

During the eighth week, the fetus’s heartbeat becomes audible through a transvaginal ultrasound. The fetus’s head is now about half the size of its body, and the eyes and ears continue to develop.

Week 9: Organ Maturation and Movement

In the ninth week, the fetus’s organs continue to mature, and the fetus begins to make more frequent movements. The limbs become more coordinated, and the fetus can now open and close its hands.

Week 10: End of Embryonic Period

The tenth week marks the end of the embryonic period and the beginning of the fetal period. The fetus is now fully formed, and all the major organs are in place.

Week 11: Fetal Sex Organs

During the eleventh week, the fetus’s sex organs become more distinct, allowing for a more accurate determination of the baby’s gender. The fetus’s nails begin to grow, and the hair follicles start to form.

Week 12: Fetal Movement

In the twelfth week, the mother may begin to feel the fetus’s movements, known as quickening. The fetus’s bones begin to harden, and the skin becomes thicker.

Week 13: Rapid Weight Gain

The fetus undergoes rapid weight gain during the thirteenth week, and the mother’s uterus begins to expand. The fetus’s eyelids open, and the vocal cords begin to develop.

Week 14: Fetal Hearing

In the fourteenth week, the fetus’s ears are fully formed, and the fetus can begin to hear sounds from the outside world. The fetus’s hair begins to grow, and the eyebrows and eyelashes become visible.

Week 15: Fetal Size and Bone Development

During the fifteenth week, the fetus is about the size of an apple, and the bones continue to harden. The fetus’s reflexes begin to develop, and the fetus can now make sucking motions.

Week 16: Fetal Activity

In the sixteenth week, the fetus becomes more active and may start to hiccup. The fetus’s skin becomes covered in a fine layer of hair called lanugo.

Week 17: Fetal Growth and Development

The fetus continues to grow rapidly during the seventeenth week, and the brain undergoes significant development. The fetus’s eyes begin to open and close, and the fetus can now make facial expressions.


The week-by-week progression of pregnancy is a remarkable journey that culminates in the birth of a new life. Each week brings about new changes and milestones, as the fetus develops from a tiny embryo to a fully formed baby. Understanding the week-by-week progression of pregnancy can provide expectant mothers with a sense of reassurance and anticipation as they prepare for the arrival of their little one.

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