Your baby will, obviously, gain some weight during the second trimester. As a matter of fact, at the beginning of the second trimester, your baby can weigh as little as just two ounces. By the end of the second trimester, however, your baby may weigh as much as 20 times more, and be right around two pounds or even more!
Every day during the second trimester, your baby will be gaining weight. His organs are developing more and more. He is starting to move, and his tiny muscles are adding mass to his body. In addition, your baby is going through all sorts of other growth and development during the second trimester. By the end of the second trimester, his lungs will inflate and deflate, her hand will be fully formed, as will her eyes (although her eyes won’t be open yet).
It is important to recognize that, for your baby to grow and develop properly, you are also going to gain some weight during the second trimester. By the end of the second trimester, you should be gaining in the neighborhood of a half a pound to a pound each and every week. Obviously, not all of this weight is baby. Much of this weight goes to the placenta, and to the uterus, and to an increased blood volume. You need to keep in mind that, just because your baby is only going to weigh a couple of pounds, you should have gained between fifteen and twenty pounds by the end of the second trimester.
During the second trimester, your health care provider might want to make certain measurements of your baby. Your health care provider may decide to use an ultrasound to determine how big your baby is, and to figure out how much that she weighs. Your health care provider will probably take some measurements of your abdomen, as well, to make sure that everything is growing along the path that it needs to be. You may be able to get your health care provider to help you figure out exactly how much your baby weighs during a second trimester prenatal visit.