A number of exciting changes in your baby’s development occur during the second trimester:
Fourth Month (Weeks 14-18)
Your baby, now weighing about 6 ounces, is growing fast and is about 8 to 10 inches long by the end of this month. The umbilical cord will continue to grow and thicken in order to carry enough blood and nourishment.
During the fourth month you will gain 3 to 4 pounds and start to “show.” Maternity clothes and a maternity bra may now be more comfortable. You may start to feel a slight sensation of movement in your lower abdomen. This feeling is like “bubbles” or fluttering. When you first feel this movement, called “quickening,” write down the date. This date may help the doctor determine when your baby is due.
Fifth Month (Weeks 19-23)
By the end of this month, your baby will weigh about one pound and be about 12 inches long. This month you may gain 3 or 4 pounds and begin to breathe deeper and more frequently. The area around your nipples may look darker and wider as your breasts prepare to make milk (lactate).
Sixth Month (Weeks 24-28)
You are now carrying a fully formed miniature baby except that the skin is wrinkled and red and there is practically no fat under the skin. The baby still needs to grow, since it is only about 14 inches long and weighs about 2 ¼ pounds. The baby may cry and suck on its thumb and you will regularly feel the baby’s movement.
You may gain 3 or 4 more pounds and experience some backache. Wearing low-heeled shoes will give you a better sense of balance and comfort during this period.