The shape of the baby’s head is often badly distorted at birth, being so long from chin to crown that the mother is deeply concerned. But you may rest quite assured that even though badly misshapen, your baby’s head in the course of a few days will assume the lovely, rounded contour so characteristic of babyhood. The temporary deformity of the head is caused by a molding and overlapping of the bones of the skull as it is forced through the narrow part of the pelvis, the inlet, that we learned about in Chapter III. About the middle of the top of the head you will be able to feel a soft, diamond shaped spot and farther back another soft spot, smaller than the one in front and somewhat triangular in its outline. These soft places are openings between the bones of the skull and are called the _anterior_ and _posterior fontanelles_. They always may be felt on the new baby’s head. =Growth and Development.= The physical progress which is made during the first year by average, normal babies who are satisfactorily nourished and cared for is fairly uniform and the average rate of this progress is somewhat as follows: =Weight.= There is a loss in weight of 6 to 10 ounces during the first week of life, after which the baby usually gains from 4 to 8 ounces each week, during the first five months. From this time the gain is only about half as rapid, or at the rate of 2 to 4 ounces weekly. At six months, therefore, the average baby weighs from 15 to 16 pounds, or double the normal birth weight of 7½ pounds, and at twelve months he weighs from 20 to 22 pounds, or three times the average birth weight. Fig. 41 gives an idea of how the baby’s weight drops during the first week and the rate of the normal weekly gain afterwards, during the first year. [Illustration: FIG. 41.—Baby’s weight chart showing the usual loss during the first week and subsequent gain during the first year of life. ] The weight is perhaps the most valuable single index to the baby’s condition that we have, but at the same time it must be remembered that a baby whose food contains an excess of sugar or starch may be of normal weight, or over, but be incompletely nourished and very susceptible to infection, while other babies who are small and gain slowly are sometimes very well and vigorous. Moreover, quite commonly there are periods in the lives of entirely normal babies during which there is little or no gain in weight. This may occur during the period from the seventh to the tenth month, for example, or in very warm weather. But the doctor is likely to want to watch the baby’s weight, for when studied in conjunction with other conditions it gives a certain amount of information about the baby’s general state and progress. =Height.= The height of the average baby at birth is about 20 inches, though boys may measure a little more and girls a little less; at six months it is about 25 inches and 28 or 29 inches at the end of a year.