By the end of the third month the limbs have definite shape, the nails being almost perfectly formed. During the next month the sexual distinctions of the external organs become well marked. By the last of the fifth month the weight has increased to one pound and the length to eight inches. Active foetal movements begin, that is, the foetus begins to move around and not lie quietly as before. This is what is usually spoken of as "feeling life," or as "quickening." There is life from the very beginning but during the first four or five months the foetus does not move about and so the mother does not "feel life." This has caused the erroneous idea that there is no life before the fifth month. By the end of the sixth month the weight is two pounds and the length twelve inches. The eyebrows and eyelashes have begun to grow and the lobule of the ear is more characteristic. By the end of the seventh month the weight is three pounds and the length fourteen inches. The surface of the body, which has appeared wrinkled, now appears more smooth owing to the increase of fat underneath. By the end of the eighth month the weight is four to five pounds and the length twenty inches. The nails have grown to project beyond the finger tips. Up to this time the body has been covered with a fine hair called lanugo. This now has begun to disappear and the skin becomes brighter and is covered with a white, cheesy material called the vernix caseosa. This almost entirely disappears during the next month, but frequently there are portions of it remaining on the body at the time of birth. The foetus is fully developed by the end of the ninth month. Then its average weight is six or seven pounds and the length twenty inches. If we could look into the womb just before the time of labor we would find the foetus attached by the cord to the placenta and floating in a sac of water. This sac is formed partly of the placenta and partly of the membrane; the side of the placenta opposite to the child being attached to the womb. Just before labor the child takes a position with its head downward, its lower limbs flexed and its arms folded upon its breast. This allows it to come in the usual way, head first. But sometimes, for various reasons, it does not take this position and some part other than the head, for instance, the feet, may be born first.