Each month, a follicle is stimulated inside a woman’s ovary and starts developing until the egg is released. This egg arrives at the Fallopian tubes where it will be waiting for the sperm.
Men expel millions of spermatozoa in the ejaculation, which are placed inside the vagina. From this moment on, spermatozoa begin a race where the goal is to reach the egg. They cross the uterus and get to the Fallopian tubes, where they will find the egg.
Only the fastest and most effective sperm will go through the membrane of the egg and then fertilization will take place. The core of both the spermatozoa and the egg join together and the result is a zygote, which will grow into an embryo. A new life has just begun.
The various sections of this article are assembled in the following table of contents.
One month pregnant
The fertilized egg is now an embryo that divides quickly. Three days after fertilization the embryo has got between 16 and 32 cells. Four days after, it is a blastocyst with 100 cells.
The embryo runs through the Fallopian tube searching for the safety of the uterus and six days after fertilization, it adheres to the endometrium and implantation finally occurs. It is difficult to know the exact day in which the embryo implants. For this reason, the first day of the last menstruation is considered as the first day of pregnancy.
We are now in the first month of the pregnancy. By the end of the fourth week, the embryo is a small circular disc of 0.1 inches in diameter.
Two months pregnant
During the second month of the pregnancy, three layers of cells are made up. These layers will lead to the formation of all the tissues of the baby-to-be. The spinal cord, the brain, the heart, the intestine, and the skin are formed. The eyes, the ears, the nose, and the upper lip as well as the limbs begin to develop.
Three months pregnant
After the third month of pregnancy the embryonic stage is over and the fetal stage begins so the embryo is now called fetus. The baby-to-be has already got all the organs but they are still developing. The fetus is about 3.35 inches in length and weights between 0.03 and 0.04 pounds. During this month the male and female genitals are formed. However, in spite of this, it is not easy to see the baby’s sex through an ultrasound. The baby moves vigorously but you cannot feel her/him yet. The baby now kicks, rotates the ankles and wrists, opens and closes the fists, and bends the toes. The baby also frowns, squeezes the lips, and makes other facial movements.
Four months pregnant
In this month, the baby’s eyes are big, shut and separated. The foetus is all covered in downy hair called lanugo. The baby now is around 5.9 inches in length and weights around 0.37 pounds. During this month you will start feeling your baby for the first time. Firstly, it is as if you had soft waves inside your belly, but soon you will distinguish the unmistakable movements of the human being that is growing inside you. The vocal cords are formed at this stage but the baby won’t be using them until the birth.
Five months pregnant
During the fifth month of pregnancy the internal organs develop faster. As regards the blood system, the heart chambers are completely delimited and the heart beats strongly. The baby’s shut eyes are prominent because the face is not round yet.
Sometimes you will think that the baby is asleep because is not moving and then, when you lay down, you feel that the baby is moving a lot. That is because
when you are lying down the baby can move more easily and when you get up, the baby gets stuck in the pelvis.
Six months pregnant
In the sixth month the baby opens his or her eyes although she/he can only perceive the light. The baby has got hair, eyebrows, and eyelashes. She/he may grow from 10.6 inches up to 12.6 inches. The length of the umbilical cord allows the baby to move in the amiotic sac she/he is in. These movements facilitate the development of the muscles.
The baby is now developing specific sleep and activity patterns. You may feel the baby’s reaction to loud noises. If you play music, you will feel his/her response, particularly to the metal instruments of an orchestra. The baby moves energetically.
Seven months pregnant
During this month, the baby’s lungs are fully developed. The skeleton is more consistent because the ossification of the bone tissues. The skin gets thicker and pigmented. The iris gets pigmented too.
The fat is stored in his/her body, which will help the baby regulating the body temperature by itself. This will be very useful once the baby is born. Now the baby is around 15 inches in length, so s/he cannot move easily anymore.
Eight months pregnant
The baby gains weigth in this month, so she/he takes up all the space in the uterus. The brain is still developing; the olfactory neurons are formed and the baby can now perceive the strong smells that you might encounter. The body hair starts falling off. The baby is now about 16.5 inches long and she/he moves with energy. Besides, his/her kicks can leave you breathless, likewise you will feel that his/her movements are spasmodic. This is due to the fact that the baby might hiccup because she/he has swallowed too much amniotic fluid. But that is a good symptom because it puts into motion the alimentary canal.
Nine months pregnant
The baby’s stomach and intestine are now working. The skin is no longer wrinkled but softer thanks to the fat cells of the skin. The baby grows up to 18.11 inches and she/he might get the head stuck in the mother’s pelvis; you will notice that your belly is lower. Once the baby is stuck, she/he moves less and you will probably only feel some kicks and weak movements. But you will feel him/her every day.
Ten months pregnant
During the tenth month of pregnancy, the baby’s organs can work autonomously and even the lungs are fully developed. The downy hair of the baby’s body has disappeared except on the shoulders and the upper arm. His or her nails are rather long (beyond the finger tips) so the baby can scratch him/herself. She/he can be around 20 inches long and is ready to come to the outside world.