Extended breastfeeding
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In Western countries extended breastfeeding usually means breastfeeding beyond the age of 12 to 24 months, depending on the culture.
Breast milk contains lactoferrin, which protects the infant from infection caused by a wide range of pathogens. The amount of lactoferrin in breast milk increases significantly during the months of 12 through 24 and remains elevated for as long as the infant continues to nurse. Research shows breastfed toddlers aged over 12 months have lower mortality rates. La Leche League writes that extended nursing provides comfort, security, and a way to calm down for the toddler, while the mother enjoys a feeling of closeness with her child.[1]
In most Western countries, extended breastfeeding is not a cultural norm and a person may face judgement with some critics who say that extended nursing is harmful. However, the American Academy of Pediatrics states there is no evidence that extended breastfeeding is harmful to the parent or child. The Academy of American Pediatrics makes a similar claim saying they find "no evidence of psychologic or developmental harm from breastfeeding into the third year of life or longer."
- The World Health Organization and UNICEF recommends babies should be breastfed for at least two years.[2]
- The American Academy of Family Physicians (AAFP) states that "[h]ealth outcomes for mothers and babies are best when breastfeeding continues for at least two years and continues as long as mutually desired by the parent and child.[3]
- The American Academy of Pediatrics (AAP) supports "continued breastfeeding, along with appropriate complementary foods introduced at about 6 months, as long as mutually desired by mother and child for 2 years or beyond".[4]
The CDC reports that about 36% of babies are still nursing at 12 months, while about 15% are still doing so by 18 months. Most toddlers naturally wean sometime between the ages of 2 and 4.[1]
Health benefits
Longitudinal research shows breastfed toddlers aged over 12 months have fewer illnesses and lower mortality rates.[5] Breast milk is known to contain lactoferrin (Lf), which protects the infant from infection caused by a wide range of pathogens. The amount of Lf in breast milk is lactation-stage related. One study looked at Lf concentration in prolonged lactation from the first to the 48th month postpartum. It was found to be at the highest level in colostrum, dropped to the lowest level during 1 - 12 months of lactation, and then increased significantly during the 13-24 months of lactation, close to the Lf concentration in colostrum. At over 24 months the level dropped, though not significantly.[6][7] These have been shown to support the child's immune system's antibodies.[7]

Psychological effects
In A Time to Wean, Katherine Dettwyler states that "Western, industrialized societies can compensate for some (but not all) of the immunological benefits of breastfeeding with antibiotics, vaccines and improved sanitation. But the physical, cognitive, and emotional needs of the young child persist."[8] Many children who are breast-fed into their toddler years use the milk as a comforting, bonding moment with their mothers.[9] The La Leche League writes:
- Toddlers breastfeed for many of the same reasons babies breastfeed: for nutrition, comfort, security, for a way to calm down and for reassurance. Mothers breastfeed their toddlers for many of the same reasons they breastfeed their babies: they recognize their children’s needs, they enjoy the closeness, they want to offer comfort, and they understand the health benefits.[1]
While the personalized nutrients of their mother's breastmilk is beneficial to the child no matter how it is delivered (bottle or breast), being fed breastmilk through a bottle takes away some of the benefits of traditional breastfeeding. The physical contact that comes with traditional breastfeeding increases the release of oxytocin in both the mother and child's blood stream.[10] This hormone is frequently referred to as the "love hormone" and plays an important role in the development of trust and bonding within a relationship. On top of the emotional bonding that comes with breastfeeding, it has been found that children who are breastfed develop language, intellectual, and motor skills both quicker and easier than those who are not and are less likely to contract a variety of viruses and diseases.[10][11]
Social acceptance
In most Western countries, extended breastfeeding is not a cultural norm and a person may face judgement and shaming. The American Academy of Family Physicians states, "There is no evidence that extended breastfeeding is harmful to parent or child."[12] The Academy of American Pediatrics makes a similar claim saying they find "no evidence of psychologic or developmental harm from breastfeeding into the third year of life or longer."[1]

