In a previous chapter it was found from comparing the analysis of mother's milk with that of cow's milk, that they widely differed in the proteins and sugar. The art of so changing cow's milk that it conforms as nearly as is possible to mother's milk is known as "modification." Where protein, sugar, and fat are given in proper amounts, healthy infants get along well; but when either the fats or proteins are given in excess, or when the digestion of the child is deranged, there is often no end of mischief.

There are two groups of milk formulas that are useful. First, those in which the fats and proteins are about the same, known as "whole milk," or "straight" milk mixtures; second, those in which the fats are used in larger proportions than proteins, and known as "top milk"—milk taken from the upper part of the bottle after the cream has risen. And since the larger proportion of babies take the lower fats or "whole milk" formulas, and seem to get along better than the babies who have the "top milk" formulas, we will first take up the consideration of the modification of whole milk.

PREPARATION FOR MODIFICATION

To begin with, everything that comes in contact with the preparation of baby's food must be absolutely clean. The table on which the articles are placed, and any towel that comes in contact with the articles or the mother's hands, or those of the nurse, must be thoroughly scrubbed.

There is only one way to prepare the utensils that are to be used in making the baby's food, and that is to put them in a large kettle and allow them to boil hard for fifteen minutes just before they are to be used. The articles needed are (Fig. 12):

BOTTLES AND NIPPLES

There is but one bottle which can be thoroughly washed and cleaned, and that is the wide-mouthed bottle. It should hold eight ounces and should have the scale in ounces blown in the side (Fig. 10). The nipple for this bottle is a large, round breast from which projects a short, conical nipple, which more nearly resembles the normal breast than do the old-fashioned nipples so frequently seen on the small-necked nursing bottles. There is a great advantage in this, in that the baby cannot grasp the nipple full length and thus cause gagging. These bottles and nipples are known as the "Hygeia," and have proven to be a great source of comfort to the baby as well as to the mother or nurse whose duty it is to keep them clean. There are a number of other nursing bottles on the market, which, if they are used, must be thoroughly cleansed with a special bottle brush each day. The neck is small and the nipple is small and great care must be taken in the cleansing of both of them.

CARE OF BOTTLES AND NIPPLES

When there is a bottle for each individual feeding in the day, immediately after each nursing both bottle and nipple should be rinsed in cold water and left standing, filled with water, until the bottles for one day's feeding have all been used. The nipples should be scrubbed, rinsed, and wiped dry and kept by themselves until their boiling preparation for the following day's feeding.

If the same bottle is to be used for the successive feedings during the day, it should be rinsed, washed with soap and water, and both bottle and nipple placed in cold water and brought quickly to the boiling point and allowed to boil for fifteen minutes. No bottles or nipples must ever be used after a mere rinsing; boiling, preceded by a thorough washing in soap and water, must take place before they are used a second time.

New nipples are often hard and need to be softened, which is readily done by either prolonged boiling or rubbing them in the hands.

All new bottles should be annealed by placing them on the stove in a dishpan of cold water and allowing them to boil for twenty minutes, and then allowing them to remain in the water until they are cold. When bottles are treated in this manner they do not break so readily when being filled with boiling water or hot food.

PREPARING THE FOOD

In a large preserving kettle place all the utensils needed in the preparation of the food—pitcher, spoon, fork, measuring glass, bottles, nipples, cheesecloth for straining, agate cup, wire strainer, in fact everything that is to be used in the preparation of the food. Now fill the kettle with cold water and place over the gas and allow to boil for fifteen minutes. On a well-scrubbed worktable place a clean dish towel, and on this put the utensils and the bottles right side up. The nipples on being taken out of the boiling water will dry of themselves; they should be placed in a glass-covered jar until they are needed for each individual feeding, the nipples not being placed on the bottles as they go to the ice box.

Having been given your formula by your physician, proceed in the following way. Suppose we were preparing the food for a normal two-months old baby that weighed ten pounds, with the prescription as follows:

DETAILS OF PREPARATION

Two level tablespoons of cane sugar are placed in the agate cup and dissolved in a small amount of boiling water. The solution should be perfectly clear, and if it does not clear up put it over the heat for a few moments.

This is now turned into the eight-ounce measuring glass which is then filled with boiling water and emptied into the two-quart pitcher. We need four and one-half more ounces of boiling water to complete the prescription requirement of twelve and one-half ounces.

The bottle of milk, if properly certified, need not be pasteurized; but if it is not, it should have been previously pasteurized while the utensils were boiling according to the suggestions found in the chapter on "milk sanitation." The top of the milk bottle should be thoroughly rinsed and wiped dry, and after a thorough shaking of the milk, the cover is removed with the sterile fork and eleven ounces are measured out by measuring glass and poured into the pitcher. All is now stirred together with an ounce of lime water, which should never look murky, but should be as clear as the clearest water and should always be kept in the ice box when not in use.

The sterile cheesecloth which has been boiled for fifteen minutes is now put over the nose of the pitcher, the contents of which is accurately measured into the seven clean, empty bottles, each containing three and one-half ounces. Over the top of each of the nursing bottles is placed a generous piece of waxed paper which is held down by a rubber band. Each meal for the day is now contained in a separate bottle, and all are placed in a covered pail of water containing ice, and put in the ice box.

If the prescription for the baby's food contains gruel, it is prepared in the following manner:

Suppose the baby is eight months old and the prescription called for two level tablespoons of flour and eight ounces of boiled water. The two level tablespoons of flour, whether it be wheat (ordinary bread flour), or barley flour, are put into a cup and stirred up with cold water, just as you would stir up a thickening for gravy; now measure out eight ounces of water and allow it to come to a boil in the inner pan of the double boiler, into which the thin paste is stirred until it comes to a boil. After boiling for twenty minutes, remeasure in the measuring glass and what water has been lost by evaporation must be added to complete accurately the prescription requirement of eight ounces; this is now added to the other ingredients of the prescription.

TABLE FOR INFANT FEEDING

We now offer a monthly schedule—a table which is the result of our experience in feeding hundreds of babies in various sections of Chicago. It is not a schedule for the sick baby, but it is a carefully tabulated outline for the normal, healthy, average child ranging from one week to one year in age. In offering this table we remind the mother, if the baby is six months old and not doing well on the food it is getting and a change is desired by both mother and physician, that it is far better to begin with the second or third month's prescription and quickly work up to the sixth month's. This change may often be accomplished in two or three days.

In all large cities there are to be found milk laboratories which make it their business to fill prescriptions for the modification of milk under the direction of baby specialists. This milk can be absolutely relied upon. In specialized diet kitchens in many large hospitals, these feeding prescriptions also may be filled.

ARTIFICIAL FEEDING SCHEDULE

(This table is calculated on the basis of about 45 calories for each pound of baby weight)

TOP-MILK FORMULA

Top milk is the upper layer of milk which has been removed after standing a certain number of hours in a milk bottle or any other tall vessel with straight sides. It contains most of the cream and varying amounts of milk. It may be removed by a small cream dipper which holds one ounce, or it may be taken off with a siphon, but it should never be poured off. To obtain seven per cent top milk which is the one most ordinarily used in the preparation of top milk formulas, we take off varying amounts—according to the quality of the milk—which Doctor Holt describes as follows:

Cream is often spoken of as if it were the fat in milk. It is really the part of the milk which contains most of the fat and is obtained by skimming, after the milk has stood usually for twenty-four hours; this is known as "gravity cream." It is also obtained by an apparatus called a separator; this is known as "centrifugal cream," most of the cream now sold in cities being of this kind. The richness of any cream is indicated by the amount of fat it contains.

The usual gravity cream sold has from sixteen to twenty per cent fat. The cream removed from the upper part (one-fifth) of a bottle of milk has about sixteen per cent fat. The usual centrifugal cream has eighteen to twenty per cent fat. The heavy centrifugal cream has thirty-five to forty per cent fat.

The digestibility of cream depends much upon circumstances. Many serious disturbances of digestion are caused by cream.

It is convenient in calculation to make up twenty ounces of food at a time. The first step is to obtain the seven per cent milk, then to take the number of ounces that are called for in the formula desired.

One should not make the mistake of taking from the top of the bottle only the number of ounces needed in the formula, as this may be quite a different per cent of cream and give quite a different result.

There will be required in addition, one ounce of milk sugar and one ounce of lime water in each twenty ounces. The rest of the food will be made up of boiled water.

These formulas written out would be as follows:

The approximate composition of these formulas expressed in percentages are as follows:

Usually we begin with number one on the second day; number two on the fourth day; number three at seven to ten days; but after that make the increase more slowly. A large infant with a strong digestion will bear a rather rapid increase and may be able to take number five by the time it is three or four weeks old. A child with a feeble digestion must go much slower and may not reach number five before it is three or four months old.

PEPTONIZED MILK

Another modification which at times may be ordered by your physician is peptonized milk. Since it is infrequent for the proteins of milk to be the cause of indigestion, peptonized milk has only a limited use, chiefly in cases of acute illness. The milk is peptonized in the following manner:

Place the peptonizing powder (it is procurable in tubes or tablets from the drug store) in a small amount of milk, and after being well dissolved, put into the bottle or pitcher with the plain or modified milk, after which the whole is shaken up together. The bottle is then put into a large pitcher containing water heated to about 110° F. or as warm as would bear the hand comfortably, and left for ten or twenty minutes (if the milk is to be partially peptonized). To completely peptonize the milk, two hours are required. Either of these formulas is only used on the advice of a physician.

BUTTERMILK

In many cases of chronic intestinal indigestion, buttermilk is used in place of the milk. It is prepared as follows: After the cream has been taken from the milk and it has been allowed to come to a boil, it is cooled to just blood heat. A buttermilk tablet, having first been dissolved in a teaspoonful of sterile water, is now stirred into the quart of warmed, skimmed milk and allowed to stand at room temperature for twenty-four hours at which time it should look like a smooth custard. With a sterile whip this is now beaten and is ready for the sugar and the boiled water which is added according to the written prescription from the doctor.

CONDENSED MILK

Under no circumstances should condensed milk be used as the sole food of the baby for more than one month. Children often gain upon it, but as a rule they have little resistance, and they are very prone to develop rickets and oftentimes scurvy; and, as noted elsewhere, orange juice should always be administered at least once during the twenty-four hours as long as condensed milk is used.

Of all the brands of condensed milk, those only should be selected which contain little or no cane sugar. Perhaps the "Peerless Brand" of evaporated milk is the most reliable and in the preparation of food from this evaporated milk the same amount of sugar, etc., should be added as we do in the preparation of "whole milk" or "top milk."

We do not in any way advise the use of condensed milk. Fresh milk should always be used where it is obtainable, but in traveling it sometimes has to be used. Holt says, "It should be diluted twelve times for an infant under one month and six to ten times for those who are older."

Malted milk is a preparation suitable in some cases where fresh cow's milk is not obtainable. Even better than condensed milk, this food will be found serviceable in traveling, or in instances where only very bad cow's milk is within reach.

SPECIAL FOODS

Most patent foods are made up of starches and various kinds of sugars, and some of them have dried milk or dried egg albumin added. Many flours under fanciful names are sold on the market today. For instance, one flour with a very fanciful name is simply the old fashioned "flour ball" that our great, great grandmothers made; and, by the way, perhaps there is no flour for which we are more grateful in the preparation of infant food than the flour ball which is prepared as follows: A pound of flour is tied tightly in a cheesecloth and is put into a kettle of boiling water which continues to boil for five or six hours, at the end of which time the cheesecloth is removed and the hard ball, possibly the size of an orange, is placed on a pie pan and allowed slowly to dry out in a low temperatured oven. At the end of two or three hours, the ball, having sufficiently dried, has formed itself into a thick outer peel which is removed, while the heart which is very hard and thoroughly dry, is now grated on a clean grater, and this flour has perhaps helped more specialists to serve more sick babies than any other form of starch known. It is used just as any other flour is used—wet up into a paste, made into a gruel, which is boiled for twenty minutes before it is added to the milk.

Whey is sometimes used in the preparation of sick babies' food and is prepared as follows:

To a pint of fresh lukewarm cow's milk are added two teaspoons of essence of pepsin, liquid rennet or a junket tablet. It is stirred for a moment, then allowed to stand until firmly coagulated, which is then broken up and the whey strained off through a muslin.