The third trimester of pregnancy is an exciting time for expectant parents as they prepare for the arrival of their new baby. This period, which lasts from week 28 to week 40 of pregnancy, is a time of rapid growth and development for the fetus, as it transforms from a tiny, delicate being into a fully-formed infant. In this article, we will explore the changes that take place during the third trimester and what they mean for the health and wellbeing of the developing baby.
Growth and Development
One of the most notable changes during the third trimester is the rapid growth of the fetus. In the first two trimesters, the baby grows at a relatively slow pace, with most of the growth occurring in the first trimester. However, in the third trimester, the baby’s growth accelerates, with the fetus gaining up to half of its birth weight in just a few short weeks.
At the beginning of the third trimester, the baby is typically around 14 inches long and weighs about 1.5 pounds. By the end of the third trimester, the baby will have grown to an average length of about 19 inches and a weight of around 7.5 pounds.
In addition to the physical growth of the baby, the third trimester is also a time of significant development for the baby’s organs and systems. The lungs, in particular, undergo significant development during this time, as they prepare for breathing outside the womb. The baby’s immune system also continues to develop, helping to protect the baby from infection after birth.
Movement and Position
During the third trimester, the baby becomes increasingly active. The baby’s movements, which may have been faint and difficult to detect in the earlier stages of pregnancy, become more pronounced and easier to feel. The baby’s movements are an important sign of health and well-being, and expectant parents should report any changes in the baby’s activity level to their healthcare provider.
As the third trimester progresses, the baby’s movements may become more restricted due to the increasing size of the uterus. The baby may also begin to move into the head-down position, in preparation for birth. While some babies remain in the breech position (feet first) until birth, most babies will move into the head-down position in the third trimester. This position is important for a safe and smooth delivery.
Preparing for Birth
In the final weeks of the third trimester, the baby’s body begins to prepare for birth. The baby’s head will engage in the pelvis, and the cervix will begin to dilate in preparation for delivery. The baby’s skin also undergoes changes, becoming thicker and less transparent in preparation for life outside the womb.
In addition to the physical changes, the baby’s brain also continues to develop during the third trimester. The baby’s brain is responsible for controlling many of the body’s functions, and the connections between neurons continue to form and strengthen during this time.
What to Expect
Expectant parents can expect to experience a number of changes during the third trimester of pregnancy. As the baby grows and develops, the expectant mother may feel more discomfort, including shortness of breath, back pain, and swelling in the feet and ankles. These changes are normal and are a sign that the baby is growing and preparing for birth.
Expectant parents should continue to attend regular prenatal appointments during the third trimester. These appointments are an important opportunity for the healthcare provider to monitor the baby’s growth and development and to address any concerns or complications.
As the third trimester comes to an end, expectant parents should begin preparing for the arrival of their new baby. This may include taking childbirth classes, creating a birth plan, and stocking up on necessary baby supplies.
It is also important for expectant parents to pay attention to their own health during the third trimester. Eating a healthy diet, getting regular exercise, and managing stress are all important for both the expectant mother and the developing baby.
The third trimester is an exciting and transformative time for the developing baby and the expectant parents. As the baby continues to grow and develop, it is important for expectant parents to be informed and prepared for the changes that take place during this critical period. By understanding the changes that occur during the third trimester, expectant parents can feel more confident and prepared for the arrival of their new baby.