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Breastfeeding: New Discoveries

by Dr. George Wootan

A lot has been written about breastfeeding in recent years, and if you are the parent of an infant or small child, you have undoubtedly read at least a little on the subject already. You may, in fact, have read so much that you wonder what more could possibly be said on the subject that would be news to you. A great deal, surprisingly. Although medical literature is full of reports of studies concerning breast milk and breastfeeding, very little of the information is actually available to the general reading public. In this article, I will share some of the scientific findings concerning breastfeeding and the mother-child relationship during this special time.

But First...

Before the breasts of a new mother produce milk, they release a thick, yellow substance called colostrum, which has immune properties. Colostrom is actually higher in protein, minerals, vitamin A, and nitrogen than milk is. Colostrum coats the baby's stomach and intestines to help ward off harmful diseases such as polio and pneumonia, and helps the baby pass meconium - a tarry substance that accumulates in the intestines. Also, cells in colostrum called macrophages destroy potentially dangerous bacteria.

The Main Course

When breast milk begins to flow (approximately two to three days after delivery), it, too, provides important vitamins and minerals for your baby, including the brain-cell builder taurine. While taurine is not an essential amino acid, its high concentration in breast milk does seem to indicate a need that cannot be met by the child's own body. But how much taurine is in formula or cow's milk? None! Yet extremely high levels of this "smart" substance are found in the brains of children, indicating that it is an important aid to brain growth. Ninety-six per cent of brain growth occurs by the age of five years. The average age at which a child weans in cultures that practice infant-led weaning is - you guessed it - five years.

Two commonly told stories about breast milk are that (1) it has very little iron and (2) it lacks vitamin D. But the fact is that breast milk does contain sufficient amounts of both nutrients, providing the mother has them to give (she should follow a balanced diet and boost her daily caloric intake to about 3,500). True, cow's milk and formula might contain more iron, but it is in a form that is poorly absorbed by infants. Babies fed these substitutes get anemic around six months of age if they don't receive supplemental iron. This is not true of breastfed infants. For example, a group of babies in Japan were totally breastfed for two years without any difficulties.

In the case of vitamin D, researchers spent a lot of time and money fruitlessly looking for that essential nutrient in the fatty portion of breast milk. But where was it? In the watery part the researchers had been discarding! Now scientists realize that there is no reason to give a nursing child vitamin D supplements ... even if Mom is an Eskimo and doesn't see the sun for six months!

Disease Prevention

Disease resistance is another benefit of breast milk, which contains 37 known immune mechanisms. These are present the entire time a mother breastfeeds her child, and can be divided into the following categories: protective bacteria, enzyme "attackers," protein binders, antiviral agents, and antibody "defenders." It is the job of these "fierce" mechanism groups to find and destroy any viruses or bacteria that may harm the baby, while also making sure he or she gets enough protein and nutrients. However, as soon as the baby is exposed to solid foods - even one bottle of sugar water - 17 of these immune mechanisms are destroyed (by the E. coli bacteria that are introduced) and can never be restored.

Overall, studies have shown that bottle-fed babies are sick more often than breast-fed babies. This is evident in the following chart:

Frequency of illness per 1,000 patients Breast-fed Formula-fed
Otitis media (inflammation of the middle ear) 3.4 6.3
Vomiting and diarrhea 2.0 4.9
Acute lower respiratory illness (pneumonia) 0.34 4.3
Hospital admission 0.34 2.9

A research study in India (where breastfeeding is more the norm than the exception) indicated that of 3,684 babies observed, 7 out of the 2,031 breastfed children got pneumonia, whereas 48 out of the 1,653 who were bottle-fed got the disease.

If you become sick with a "bug" while nursing, don't fret about spreading the sickness to your child. Amazingly enough, white blood cells appear in the breast milk on the fourth day after the mother is exposed to the illness - cells her body has created specifically to eat that bacterium or virus! Thus your milk will give your child a specific antidote for the illness you are worried about. (This sickness-healing sequence obviously works better if the mother gets sick first. Fortunately, most times, mothers are "considerate enough" to do so.)

Drug Usage While Nursing

In general, it is best to avoid drugs (including the "social" ones) while nursing. Even aspirin must be taken with caution, since approximately one-twelfth of an adult dosage is equivalent to a full dosage for a ten-pound baby. To find out if a particular medicine is safe, please consult your local La Leche League leader. Remember that drugs secreted through the placenta are not necessarily secreted through the breast, since the placenta and the breast are different kinds of transfer organs.

Advantages For Mom

Breastfeeding benefits the mother by stimulating the release of the hormone prolactin, which has been found to induce maternal behavior in laboratory animals. Another "nursing hormone", oxytocin, helps to squeeze the milk into the ducts that lead to the nipple; it also helps to relax the mother. The baby's sucking also helps the mother's uterus contract to normal size, lowering the amount of blood loss.

Of course, the increased opportunity for parent-child bonding offered by breastfeeding is a widely known benefit of nursing, which brings up an interesting sidelight. A baby can have lots of brain cells, but they won't do any good unless they're interconnected. The nerve fibers that connect these cells are called dendrites. And what develops dendrites? You probably said breast milk ... right? Wrong! Touching develops dendrites. Holding, touching, and stroking a baby, as a mother naturally does while nursing ("you can prop a bottle but not a breast"), helps the child develop the way nature intended, both physically and emotionally.

When to Start Foods

If this thin, watery stuff called milk is so good, when do you need to start feeding your baby "real" food? This is a difficult question to answer. Recent studies have shown that hydrochloric acid - used to digest most protein - doesn't even appear in the stomach until the end of the seventh month and doesn't reach a peak until the eighteenth month. Coincidentally, 18 months is approximately when rennin - used to digest the protein in breast milk - has disappeared. Also, it seems that ptyalin, the digestive juice for carbohydrates, doesn't appear until the end of the baby's first year. (The earliest books on baby care always recommended that mothers pre-chew any solid food.)

You may say that your baby was so hungry that he or she was fighting for solid food at five months, but actually this probably isn't what was happening. The fact of the matter is that in your house you have this strange custom. Each day without fail you gather the clan around a square board and all of you stuff strange-looking things in your faces. The baby probably just wanted to be part of the clan ritual. Remember - babies tend to mimic the behavior of those around them.

I leave to you the decision of when to start foods, but let me offer two pieces of advice. First, don't force food on your baby. He or she will let you know when breast milk isn't completely satisfactory by showing an increased interest in nursing sessions (which you will soon discover is not due to a growth spurt). Second, instead of feeding your child, just let the youngster feed him or herself, from food you place on the high chair tray. (As the father of eleven children, I know this can be quite a messy experience!)

This way, not only will your child be less likely to overeat, but the little one will also tend not to eat foods he or she may be allergic to. By the way, honey, nuts, heavily sweetened foods, and spicy or salty foods are definitely not recommended for babies.

When to Wean

As soon as the baby is introduced to anything other than breast milk, the weaning process has begun. It is best to do this slowly, and, as with solid foods, let the baby tell you when he or she is ready, and allow him/her to set the pace. Contrary to popular belief, a child who is weaned at a late age is not any more dependent than a child weaned earlier. In fact, the late nurser may be more independent because the choice to break away from Mom was his or her own. So, don't let yourself be influenced by the behavior or reactions of other mothers - this is a decision between you and your child.

Breast milk is "species-specific". It has everything in it that the baby needs, in just the right amounts. It fulfills both physical and emotional needs. It is not habit-forming, and all children wean themselves when they have had enough. Try it. You, and yours, will like it.

Put Nursing Fears to Rest

Does the thought of nursing give you butterflies? If so, here are some helpful hints.

The first two or three weeks of breastfeeding can be very difficult for a new mother, but take a deep breath ... and relax! It is very important to get plenty of rest during the nursing period, as this will stimulate the let-down reflex - the squeezing of milk from the alveoli. Fear, anxiety, confusion, or fatigue can hamper this reaction, so find a comfortable, tension-free place to nurse.

Two common misbeliefs are that (1) small-breasted women cannot produce enough milk and that (2) if you do not have enough milk when you begin nursing, you will never satisfy your baby's great need for nourishment. Neither of these beliefs are true! In all pregnant women a physical change occurs in the milk ducts that enlarges the breasts. In addition, the more your baby nurses, the more milk your breasts produce. And a new baby nurses approximately every 1-1 hours at first.

It may take almost a week for you and your baby to nurse successfully - but don't give up! Going to a series of La Leche League meetings while you're pregnant will help establish a support system, in case you have problems later. To locate a La Leche League leader in your area, see "Finding Local Help" at the La Leche League International web site, or phone the League at 1-800-LALECHE or (847) 519-7730. An expert is always on hand to offer advice and support.
 

 
This article originally appeared in The Mother Earth News as "An Update on Breastfeeding". Reprinted with permission by the author.

Books encouraging breastfeeding and child-led weaning

George Wootan, M.D., is a Board Certified Family Practitioner and a Medical Associate of the La Leche League International. He is available for telephone consultations at (800) 635-2126.

For information on Dr. Wootan's book, Taking Charge of Your Child's Health, his audiotape course, "Pediatrics: A Course for Parents", "The Living Well Program" health plan, and other products and services, contact him by e-mail at gwootan@pol.net or at the following address: George Wootan, M.D., P.O. Box 270, Hurley, NY 12443 USA.
 

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