Understanding the fetal development across the three trimesters


Stages of pregnancy are divided into three trimesters- first trimester, second trimester and third trimester. Each trimester lasts between 12 and 14 weeks, or almost about three months. A normal, full-term pregnancy is 40 weeks; however, this may range from 37-42 weeks.

Each trimester comes with its own definite physiological and hormonal changes. Being aware of the ways that your growing baby is affecting your body will assist you to better prepare yourself for these changes as they take place. Would be mothers can also watch step by step baby growth during pregnancy video in order to get more information about the growth and development of the baby. It is also helpful to be conscious of the specific risk factors and related medical tests for each of the three trimesters.

First trimester

The first trimester lasts from the first through the thirteenth week of pregnancy. Even though you may not look pregnant during this period but your body will be going through huge changes as it accommodates a growing baby. During the first trimester, babies grow quickly as they pass through two official stages of development. The eyes, nose, ears, spine, nervous system and digestive system start to develop during this period. Within the eight week, the fetus develops all organs and the heart starts to function while the bones begin to grow. By the thirteenth week, the fetus move in the amniotic fluid and the healthcare provider may be able to hear the fetal heart rate with an electronic listening device.

Second trimester

The second trimester starts from 13 week and continue till 27 week. This is the most comfortable period of time for the most of pregnant women. During this period, the baby’s toes and fingers become well-defined. His eyebrows, eyelids, eyelashes, hair, and nails are formed, and bones and teeth are becoming thicker. The baby can even suck the thumb, stretch, yawn, and make faces. The nervous system is starting to function and the reproductive organs and genitalia are now completely developed. The health care provider can see on ultrasound if you are having a girl or a boy.

Third trimester

This trimester lasts from the 28th week through to the birth of your baby. During the third trimester, you will start seeing your healthcare provider more often. By the 28th week, your baby can open eyelids can partially and eyelashes have formed fully. The central nervous system can control body temperature and direct rhythmic breathing movements. The baby can now stretch, kick and make grasping movements. Thirty one weeks into your pregnancy your baby has finished most of his or her most important development. Now it is the time for the baby to gain weight quickly. By the thirty five weeks, your baby’s kidneys will develop fully and his liver will also start functioning. He continues to add weight. From thirty eight weeks onward you can expect that your delivery may happen at any point of time.

By watching growth of baby during pregnancy video you can see all that takes place during these three trimesters of your pregnancy to get a clear idea about the growth and development of the baby.