During the fifth month, the baby is growing rapidly and is becoming much more active as the muscles are being strengthened. The baby sleeps and wakes at regular intervals. It is likely that you will feel movement at this time. The internal organs are maturing, and fat is being stored beneath the skin. Body hair is beginning to grow, and the skin is covered with vernix, a protective covering. Fingernails reach the tips of the fingers. Tonsils are developed, and milk teeth begin forming under the baby's gums. The baby's gall bladder begins producing the bile required for digestion. By the end of this month, the baby will be 8-12 inches long and weigh between ½ and 1 pound!