Although all the organs are present by the end of the first trimester, the fetus is not yet able to live outside the mother's body. The second trimester is devoted primarily to maturation of the organs. By the fourth month, the fetus moves spontaneously but is too small for the mother to feel this movement. The fetus is four to five inches long and weighs three ounces.
By the fifth month, however, the fetus is six inches long and weighs 1/2 pound. The mother's growing perception of the baby's movement is known as quickening. In the fifth to sixth month, the body becomes covered with fine hair, or lanugo, and coarser hair appears on the head.
After the sixth month you are ready for the final push before the baby is born. Some mothers find this to be the most uncomfortable time. In the next section, we will show you what to expect during the third trimester.
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