Pregnancy Stage: Three Trimester & Fetal Development Week By Week

Pregnancy stage is actually divided into three stages known as first, second, and third trimester. In fact, each trimester consists of more than thirteen weeks and the first month of pregnancy is the first trimester.

Pregnancy, actually last for about nine months but since pregnancy is measured from the very first day of the last menstrual period, it is around ten months. Obviously, you know that women become pregnant about three to four weeks before they are pregnant because the count begins from the last menstrual period.

Most of the people, especially woman during the pregnancy period are curious to know the stage of Pregnancy, the three trimesters and the fetal development as per week or month wise. To quench the thirst of such readers, here we are disclosing closely, yet with a cohesive guideline on each of the pregnancy stage (the three trimesters) and the fetal development week wise, which in fact, will give you a clear idea actually what happens during each stage in pregnancy and how the fetus develops.

Pregnancy Stage-1 (The First Trimester)

Pregnancy Stage-1 (The First Trimester)

The duration from week 1 to week 12 is considered to be the first Trimester, which is also called pregnancy stage 1. The woman’s body goes under significantly many changes. The stop of the period is a clear sign of pregnancy. The hormonal changes in this stage, in fact, influences almost every organ of the body, and these changes bring some symptoms from the very first week of pregnancy stage, the first trimester. Extreme tiredness, especially morning sickness is the very common sign of pregnancy stage 1. Mood swings are also a common sign. More often urination, trouble in bowel movement, headache are also observed in this stage. Sometimes, some of the women also loose and some of the women gains weight during this stage.

Fetal Development At Pregnancy Stage-1

The Fetal Development During 2-13 Weeks (First Trimester)

2 Weeks Pregnancy

The egg is fertilized twelve to twenty-four hours after the sperm penetrate the female egg cell. And as a result, over the next several days the fertilized eggs start dividing into multiple cells.

3 Weeks Pregnancy

Multiplying cells like a microscopic ball called as blastocyst start producing hormone hCG. And indeed, such hormone instructs the ovary to stop releasing eggs.

4 Weeks Pregnancy

The ball is officially an embryo. In this time, home pregnancy test results as a positive pregnancy. Furthermore, the embryo size is like a poppy seed.

5 Weeks Pregnancy

The baby starts growing fast these weeks and the circulatory system is developed at this time. Again, interestingly, in these weeks, the very tiny heart starts beating in this week.

6 Weeks Pregnancy

The intestines and brain began to develop as well as mouth, nose, and ears start to take shape this week. The size in fact in this week is of the size of a lentil.

7 Weeks Pregnancy

Arms and legs start to develop from paddles like shape. In addition, the baby becomes double in size than week 6. In fact, the size becomes similar to a blueberry.

8 Weeks Pregnancy

In these weeks the baby sizes like a kidney bean and consequently, the neural pathways develop in these weeks. The lunge also develops in this week. Though the baby starts moving, the woman cannot feel in this stage.

9 Weeks Pregnancy

The baby size becomes like a grape as well as weighs around an ounce.

10 Weeks Pregnancy

The nail starts to develop in these weeks. Furthermore, the tiny limbs can bend and the size becomes of a kumquat.

11 Weeks Pregnancy

In fact, during these weeks, the size becomes like a fig. The baby starts kicking and even it starts hiccupping. But the woman cannot feel the kick and hiccup in this stage.

12 Weeks Pregnancy

The baby size develops as the size of a lime. The finger also gets activities like opening and closing. The toes also start curling by the baby. The mouth of the baby also makes sucking movements. If you gently poke at the tummy of the woman, the baby feels it, which in fact is the most interesting development.

13 Weeks Pregnancy

The baby size develops as the size of a pea pod. In addition, the fingerprints develop in these weeks. The veins, as well as organs of the baby, become clearly visible through the skin.

Pregnancy Stage-2 (The Second Trimester)

Pregnancy Stage-2 (The Second Trimester)

The duration from week 13 to week 18 is considered to be the second trimester. In this stage, a woman finds it easier than the first stage, especially the morning sickness goes down. Interestingly, in this stage, a woman can feel that the baby moves! The baby bump starts in this stage and the woman finds that her abdomen expands since the baby is growing.

Thigh aches and pain, back pain as well as the abdomen pain are also common in most of the case. Stretches on abdomen, thighs, buttock or breast development in this stage. Skin darkening around the nipples and a line running from the button of the belly to hairline around pubic over the skin is also developed. Numbness in hand is also a very common symptom in this stage. Though itching on the palms, abdomen, and soles of the feet are very common, consult your doctor while encountering symptoms of vomiting and yellowish skin along with the mentioned itching.  Ankles and fingers swelling and are also very common but if it is extreme, you must consult your doctor immediately.

Fetal Development At Pregnancy Stage-2

Fetal Development During 14-27 Weeks (Second Trimester)

14 Weeks Pregnancy

The baby size develops as the size of a lemon. The kidney starts working. Furthermore, even the baby starts sucking his thumbs in week 14. The baby also starts using his facial muscles.

15 Weeks Pregnancy

The baby size develops as the size of an apple. During these weeks, the sense of light also develops. Though the baby’s eyelids are still shut, he can sense light if you shine a flashlight on your tummy

16 Weeks Pregnancy

The baby size develops as the size of an avocado. The legs developed more and the head becomes more upright. In addition, you can feel the baby’s kick. On the other hand, the ears are closer to the final development.

17 Weeks Pregnancy

The baby size develops as the size of a turnip. The baby can move the joints easily. In fact, the umbilical cord develops as stronger and thicker.

18 Weeks Pregnancy

The baby size develops as the size of bell pepper and interestingly, the movement of the baby inside the womb becomes easy to feel for the woman.

19 Weeks Pregnancy

The baby size develops as the size of an heirloom tomato. The senses of touch, vision, hearing, taste, as well as smell, develop in this stage.

20 Weeks Pregnancy

The baby size develops as the size of a banana. The baby’s digestive system is up to the mark. The baby poops in this stage.

21 Weeks Pregnancy

The baby size develops as the size of a carrot. The movement of the baby increases in this stage.

22 Weeks Pregnancy

The size of the baby develops as the size of spaghetti squash. The baby’s shape becomes like a miniature of a newborn baby.

23 Weeks Pregnancy

The size of the baby develops as the size of a large mango. The hearing sense develops tremendously.

24 Weeks Pregnancy

The size of the baby develops as the size of an ear of corn.

25 Weeks Pregnancy

The size of the baby develops as the weight of the average rutabaga. The hair begins to come out in this stage.

26 Weeks Pregnancy

The size of the baby develops as the size of a bunch of scallions. The breathing of the baby becomes a developed one in this stage, which is most important for the baby to at air after birth.

27 Weeks Pregnancy

The size of the baby develops as the size of a head of cauliflower. The baby in this stage starts sleeping and waking up on a regular schedule. The brain of the baby also becomes more active in this stage. This stage, indeed, is the last week of the second trimester.

Pregnancy Stage-3 (The Third Trimester)

Pregnancy Stage-3 (The Third Trimester)

Week 29 to week 40 is considered to be the third trimester. It is in fact, the last and final stage of pregnancy. The discomfort during stage 2 started to fade away in this stage with new ones, though in some cases some of the discomforts of stage 2 exist along with new ones. Since the baby grows inside the woman, which cause extra pressure inside the woman. The woman may face breathing difficulties. Frequent discharge of urination is very common during this stage, which is in fact very normal a woman should not be worried about. Such frequent urination soon will move away after the delivery. Swelling of ankles, fingers, and face are common like in the stage of 2 but if it is extreme, you must consult to your doctor immediately. Watery milk is also common in this stage. Belly button shape changes are also very common during this stage. The woman can feel the movement of the baby inside her. Difficulties in sleeping, shortness of breath, heartburn also develop in a woman during this stage. The cervix becomes thinner and softer.

Fetal Development At Pregnancy Stage-3

Fetal Development During 28-40 Weeks (Third Trimester)

28 Weeks Pregnancy

The size of the baby develops as the size of a large eggplant when the blinks of eyes become more frequent.

29 Weeks Pregnancy

The size of the baby develops as the size of butternut squash. The body muscles, as well as the lunges, become busy to be developed for the sooner exposer in the earth. The head also starts growing for the brain’s accommodation.

30 Weeks Pregnancy

The size of the baby develops as the size of a large cabbage.

31 Weeks Pregnancy

The size of the baby develops as the size of a coconut. The baby in these weeks can turn head from one side to another. On the other hand, a layer of protective skin grows over the arms and legs in these weeks.

32 Weeks Pregnancy

The size of the baby develops as the size of a large jicama. The baby starts gaining weight faster.

Weeks 33

The size of the baby develops as the size of a pineapple.

34 Weeks Pregnancy

Now the baby sizes as a cantaloupe. In fact, during the weeks 34, the central nervous system becomes mature.

35 Weeks Pregnancy

Now the baby sizes like a honeydew melon and the kidney properly develops in these weeks.

36 Weeks Pregnancy

The baby sizes now like a head of romaine lettuce.

37 Weeks Pregnancy

These weeks suggest that the delivery date is very near and the baby sizes like a bunch of Swiss Chard.

38-40 Weeks Pregnancy

During weeks 38 the baby sizes like a leek whereas, in weeks 39, the baby sizes like a mini watermelon. Finally, the baby sizes like a small pumpkin in weeks 40. Weeks 39- 40 is the last weeks for the baby to come to the earth.

It is, in fact, a very common, yet obvious believe that a healthy mother can give birth to a healthy child.  Every woman, even every man should be very conscious about health. Before pregnancy, a woman should take care of diabetes,  hypertension, and also Orthostatic Hypotension (Low BP), if she is suffering from. Diabetes during pregnancy is also very common among some women but soon after the delivery, diabetes moves away. In addition, the proper immune system also is very necessary during pregnancy to avoid some negative consequences.