The second trimester is, in many ways, a period of transition. During this time, your morning sickness is likely passed, and you may experience a higher degree of energy than what you’ve had during that first trimester of pregnancy. It’s not just you that’s changing at this time, however. Your baby is undergoing a number of amazing changes during the second trimester. When that second trimester begins, for example, your baby weighs in at just a few ounces. By the time the end of the second trimester rolls around, your baby is likely to way nearly two pounds.
Also during this time, your baby’s organs are going to undergo quite a bit of development. Your baby’s lungs are going to begin to inflate and deflate, for example, and other organs will begin to grow.
One of the most significant changes that takes place with your baby during the second trimester is movement. At around the thirteenth or fourteenth week of pregnancy, your baby begins to move quite a bit. She will be moving her little arms and legs around, and she will even be starting to kick during the second trimester. However, you probably won’t be able to feel these movements until later during the second trimester.
During the middle part of your second trimester, your baby will be able to make a fist for the first time. Her eyes start to become light-sensitive, and she’ll start to make various facial expressions. She’ll also begin to develop her sense of humor.
Towards the end of the second trimester, your baby will experience more changes. His hands will become fully formed, and so will his eyebrows and even his eyelashes. His eyes won’t open yet, however; that is a change that won’t take place until a little bit into your third trimester of pregnancy. By the end of the second trimester, your baby’s chances of surviving if he were born prematurely are extremely high, as well.