Modern Housewife: 101 Reasons to breastfeed

The American Academy of Pediatrics recommends breastfeeding
According to the AAP, "Human milk is species-specific, and all substitute feeding preparations differ markedly from it, making human milk uniquely superior for infant feeding. Exclusive breastfeeding is the reference or normative model against which all alternative feeding methods must be measured with regard to growth, health, development, and all other short- and long-term outcomes. In addition, human milk-fed premature infants receive significant benefits with respect to host protection and improved developmental outcomes compared with formula-fed premature infants… Pediatricians and parents should be aware that exclusive breastfeeding is sufficient to support optimal growth and development for approximately the first 6 months of life and provides continuing protection against diarrhea and respiratory tract infection. Breastfeeding should be continued for at least the first year of life and beyond for as long as mutually desired by mother and child."

The American Dietetic Association promotes breastfeeding
The ADA also believes that "the bonding that occurs during breastfeeding makes it a special choice." The ADA actively promotes breastfeeding, stating that "It is the position of the American Dietetic Association that broad-based efforts are needed to break the barriers to breastfeeding initiation and duration. Exclusive breastfeeding for 6 months and breastfeeding with complementary foods for at least 12 months is the ideal feeding pattern for infants. Increases in initiation and duration are needed to realize the health, nutritional, immunological, psychological, economical, and environmental benefits of breastfeeding."
Breast milk is more digestible than formula
"In recent years nutritionists have voiced concern about overly high levels of protein in the American diet. Since cow's milk contains about twice as much protein as human milk, formula-fed babies usually receive more protein than they need (much of it in the form of the less digestible casein). The stools of formula-fed babies are so bulky because the babies cannot absorb so much protein, and excrete the excess in their stool, whereas breast-fed babies absorb virtually 100% of the protein in human milk."

Not breastfeeding increases mother's risk of breast cancer
Many studies have shown that women who breastfeed have lower risks of developing breast cancer. Recently, data from 47 studies in 30 countries was re-examined. The study group concluded that the incidence of breast cancer in developed countries could be reduced by more than half if women had the number of births and lifetime duration of breastfeeding that have been common in developing countries until recently. According to the analysis, breastfeeding could account for almost two-thirds of this estimated reduction in breast cancer incidence.
Baby's suckling helps shrink mother's uterus after childbirth
The uterus of the non-breastfeeding mother will never shrink back to its pre-pregnant size. It will always remain slightly enlarged.

"Nursing will help you to regain your figure more quickly, since the process of lactation causes the uterus (which has increased during pregnancy to about 20 times its normal size) to shrink more quickly to its pre-pregnancy size. "
Formula feeding increases baby girls' risk of developing breast cancer in later life
Women who were formula-fed as infants have higher rates of breast cancer as adults. For both premenopausal and postmenopausal breast cancer, women who were breastfed as children, even if only for a short time, had a 25% lower risk of developing breast cancer than women who were bottle-fed as infants.

Formula Feeding is associated with lower I.Q.
Human breast milk enhances brain development and improves cognitive development in ways that formula cannot. One study has found that the average I.Q. of 7 and 8 year old children who had been breastfed as babies was 10 points higher than their bottle fed peers. All of the children involved had been born prematurely and tube fed the human milk, indicating that the milk itself, not the act of breastfeeding, caused this difference in I.Q. level. Another study to support this statement was done in New Zealand. Here an 18 year longitudinal study of over 1,000 children found that those who were breastfed as infants had both higher intelligence and greater academic achievement than children who were infant-formula fed.

Breast milk is always ready and comes in a nicer package than formula does
Need we say more?

Breast milk helps pass meconium
Babies are born with a sticky tar-like substance called meconium in their intestines. Colostrum, or early milk, is uniquely designed to help move this substance through the infant's body.

Breast milk contains immunities to diseases and aids in the development of baby's immune system.
Formula provides neither of these benefits. "Breastfed babies have fewer illnesses because human milk transfers to the infant a mother's antibodies to disease. About 80% of the cells in breast milk are macrophages, cells that kill bacteria, fungi, and viruses. Breastfed babies are protected in varying degrees from a number of illnesses including, pneumonia, botulism, bronchitis, staphylococcal infections, influenza, ear infections, and German measles. Furthermore, mothers produce antibodies to what ever disease is present in their environment, making their milk custom-designed to fight diseases their babies are exposed to as well."